Category Archives: Uncategorized

Inter-monsoon conditions to persist with prevailing winds that are light and variable in direction.  Expect mostly afternoon thundery showers with high lightning activities during the period. 

Singapore, 2 May 2018 – The prevailing inter-monsoon conditions are expected to persist over Singapore and the surrounding region in May 2018. The low level winds during the first fortnight of May 2018 are forecast to be light and variable in direction.

2          During the inter-monsoon period, weak prevailing winds coupled with strong solar heating of land areas make it conducive for the development of thunderstorm clouds which could grow to heights more than 10-12 km. Climatologically, the moderate to heavy thundery showers during the inter-monsoon months tend to fall more in the afternoon than at other times of the day. In addition, lightning activities tend to be more intense during this period. May has the second highest number of lightning occurrences after November.

3          The first fortnight of May 2018 is expected to be wet with most of the thundery showers falling in the first week of May 2018. During the fortnight, short-duration moderate to heavy thundery showers are expected mostly in the afternoon on six to eight days. On a few of these days, the thundery showers could start earlier in the late morning and extend into the afternoon. On one or two days in the fortnight, the prevailing winds could shift to blow from the southwest, and could bring widespread thundery showers with gusty winds to the island in the morning. The rainfall in the first fortnight of May 2018 is expected to be near normal.

4          May is climatologically one of the warmest months of the year. During the first fortnight of May 2018, the daily temperature is expected to range between 25°C and 33°C. A few warm days are expected during this period where the daily maximum temperature could reach a high of around 35°C on a few afternoons.

5         For updates of the daily weather forecast, please visit the MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, MSS’ Weather@SG app.

REVIEW (1 – 30 April 2018)

6          Inter-monsoon conditions onset in early April 2018 and persisted for the rest of the month. The prevailing winds in April 2018 were predominately light and variable in direction.

7          In April 2018, most of the thundery showers experienced in Singapore fell in the afternoon due to strong daytime heating of land areas. On a few of these days, the thundery showers extended into the evening. The second half of April 2018 was wetter than the first half of the month, and the thundery showers were also more intense. The three highest daily total rainfall recorded in April 2018 were 83.0mm, 109.8mm and 138.0mm on 23 April, 20 April and 7 April 2018 respectively.

8          In April 2018, the daily maximum temperature ranged between 31.5°C and 35°C, and the daily minimum temperature ranged between 22.0°C to 25.5°C. The highest daily maximum temperature of 35°C was recorded at Pulau Ubin and Changi on 25 April 2018. This ties with the highest daily maximum temperature recorded in 2016 at the climate station in the last ten years. The highest daily maximum temperature recorded at any station across the island in the last ten years was 36.6°C at Pulau Ubin in 2016.

9         About two-thirds of Singapore received above-normal rainfall in April 2018. The lowest rainfall of 61.2 mm (59% below average) was recorded at Changi. Rainfall was highest around Choa Chu Kang where 408.1mm (58% above average) was recorded.

CLIMATE STATION STATISTICS FOR MAY (Climatological reference period: 1981 – 2010)

Wet weather conditions expected in the first fortnight of 2018. Short-duration thundery showers between the afternoon and evening on some days, and occasionally windy conditions with widespread moderate to heavy rain and cool temperatures on a few days due to a monsoon surge.

Singapore, 2 January 2018 – The prevailing Northeast Monsoon season is forecast to continue into the first fortnight of 2018. During the next two weeks, the low level winds over Singapore and the surrounding vicinity are expected to blow mainly from the northeast or northwest.

2           The wet weather conditions experienced in Singapore in the last few days of December 2017 are expected to continue in the first half of January 2018. During the two weeks, moderate to heavy thundery showers are forecast in the afternoon on six to eight days. On a few of these days, the thundery showers could extend into the early evening. A monsoon surge[1] could affect the South China Sea and the surrounding region in the latter half of the fortnight. The surge is expected to bring a few days of occasionally windy conditions with widespread moderate to heavy rain and cooler temperatures to Singapore. Rainfall for the first half of January 2018 is expected to be above normal.

3           During the first fortnight of January 2018, slightly cooler night-time minimum temperatures of 23°C to 24°C can be expected. The maximum day-time temperatures are likely to range between 31°C and 33°C.

4          For updates of the daily weather forecast, please visit the MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, MSS’ Weather@SG app.

REVIEW (1 – 31 December 2017)

5          Northeast Monsoon conditions prevailed over Singapore and the surrounding region in December 2017, and the low level winds were predominantly from the northeast or northwest.

6          In early December 2017, strong solar heating of land areas coupled with convergence of winds brought moderate to heavy thundery showers over Singapore in the afternoon and early evening on several days. In the third week of the month, the presence of two consecutive tropical storms in the South China Sea had an influence on the weather and wind conditions in the surrounding region. Winds over Singapore shifted to blow from the southwest and the passage of Sumatra squalls across the island brought widespread thundery showers in the predawn hours and morning on a few days.  In the last week of the month, a monsoon surge on 30-31 December 2017 brought overcast and occasionally windy conditions with periods of widespread moderate to heavy rain to Singapore. The highest total daily rainfall recorded in December 2017 was 149.6mm around the Buona Vista area on 31 December 2017.

7          In December 2017, the daily maximum temperatures ranged between 26.8°C and 35.1°C, and the daily minimum temperatures ranged between 22.3°C and 25.6°C. At the climate station, the daily maximum temperature of 33.5°C recorded on 1 December 2017 is among the top five daily maximum temperature on record for December since 1929. In addition, the mean monthly temperature of 27.1°C for December 2017 is 0.7°C above the long-term mean for December.

8          About half of Singapore received above normal rainfall in December 2017. The highest rainfall of 502.4mm (65% above average) was recorded around the Seletar area. Rainfall was lowest around the Bukit Panjang area where 211.6mm (28% below average) was recorded.

[1] A monsoon surge refers to the strengthening of northeasterly winds blowing from a strong high-pressure system over the northern Asian continent toward the South China Sea, bringing periods of prolonged widespread rain and windy conditions to the surrounding region including Singapore and Peninsular Malaysia. (Further information is available at  https://www.weather.gov.sg/learn_weather_systems/)

CLIMATE STATION STATISTICS FOR JANUARY (Climatological reference period: 1981 – 2010)

Singapore to experience short-duration thundery showers in the afternoon and evening, as well as occasionally windy conditions under the influence of Northeast Monsoon.

Singapore, 15 December 2017 – Singapore and the surrounding region is currently experiencing the wet phase of Northeast Monsoon which typically lasts from December till January.  The low level winds over Singapore are expected to blow predominantly from the northeast or northwest.

2          In the next fortnight, Singapore is expected to experience moderate to heavy short-duration thundery showers in the afternoon and evening on five or six days. In addition, a weak monsoon surge[1] could develop over the South China Sea and the surrounding region and this could bring a few days of occasionally windy conditions with moderate rain as well as cooler temperatures to Singapore. On one or two days, the winds in the region may temporarily blow from the west due to a low pressure system in South China Sea and bring widespread moderate to heavy thundery showers in the predawn hours and morning.  Rainfall for the month of December 2017 is expected to be slightly below normal.

3           During the period, slightly cooler night-time minimum temperature of 23°C to 24°C can be expected.   The maximum day-time temperatures are likely to range between 31°C and 33°C.

4          For updates of the daily weather forecast, please visit the MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, MSS’ Weather@SG app.

REVIEW (1 – 14 December 2017)

5          In the first fortnight of December 2017, Northeast Monsoon conditions prevailed over the region.  Low level winds over Singapore were blowing mainly from the northeast or northwest.

6          During the early part of the fortnight, Singapore experienced afternoon showers mainly over the northern parts of the island.  Thereafter increasing shower activities were experienced in Singapore due to the influence of the strengthening north-easterly winds in South China Sea.  During the second week of the fortnight, Singapore experienced widespread moderate to heavy showers in the afternoon and early evening on several days. The highest daily rainfall of 74.6mm was recorded on 10 December 2017 around Upper Peirce Reservoir area.

7          The daily maximum temperatures during the period generally ranged between 31°C and 33°C.  As wetter weather conditions set in during the second week of the fortnight, slightly cooler night-time temperature of 23°C to 24°C was experienced, with the lowest minimum temperature of 22.3°C recorded on 14 Dec 2017 over the northern part of the island.

8          More than two-thirds of the island received well below normal rainfall in the first fortnight of December 2017. The highest rainfall of 268.6mm (96% above average) was recorded around the Seletar area. Rainfall was lowest around the Queenstown area where 25.6mm (81% below average) was recorded.

[1] A monsoon surge refers to the strengthening of northeasterly winds blowing from a strong high-pressure system over the northern Asian continent toward the South China Sea, bringing periods of prolonged widespread rain and windy conditions to the surrounding region including Singapore and Peninsular Malaysia. (Further information is available at  https://www.weather.gov.sg/learn_weather_systems/)

CLIMATE STATION STATISTICS FOR December (Climatological reference period: 1981 – 2010)

Singapore experiencing Northeast Monsoon conditions. Generally wet weather over the coming fortnight and a few cool nights. 

Singapore, 30 November 2017 – Singapore and the surrounding region are currently experiencing the Northeast Monsoon which set in over Singapore in the second half of November 2017. During the Northeast Monsoon season, the prevailing low level winds typically blow predominantly from the northeast.

2          The Northeast Monsoon season typically comprises a wet phase from December to January, followed by a dry phase from February to March.  The wet phase is characterised by short-duration moderate to heavy thundery showers, mostly in the afternoon, and on some days extending into the evening. In addition, there can be two to four episodes of monsoon surges[1] which usually bring prolonged, widespread rainfall lasting between two and five days, occasionally windy conditions, and cooler temperatures to Singapore.

3          In the first fortnight of December 2017, wet weather conditions are expected to prevail over Singapore and the surrounding region. During this period, Singapore is expected to experience moderate to heavy short-duration thundery showers in the afternoon and evening on five or six days. Widespread moderate to heavy thundery showers with occasional windy conditions can also be expected between the predawn hours and morning on one or two days.

4          Around the second week of the fortnight, a monsoon surge could develop and affect the South China Sea and the surrounding region. This could bring a few days of cooler temperatures, occasionally windy conditions and widespread moderate to heavy rain to Singapore. Rainfall for the first fortnight of December 2017 is forecast to be well-above normal.

5           During the first half of December 2017, daily maximum temperatures of between 31°C and 32°C are expected.  On a few rainy days during the fortnight, the daily maximum and minimum temperatures could drop to around 29°C and 22°C respectively.

6          For updates of the daily weather forecast, please visit the MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, MSS’ Weather@SG app.

REVIEW (1 – 29 November 2017)

7          In the second half of November 2017, the prevailing light and variable winds gradually strengthened to blow from the northeast or northwest as the region transitioned from inter-monsoon conditions to the Northeast Monsoon.

8          In November 2017, the presence of the monsoon rain band over the equatorial belt brought above normal rainfall to most parts of the southern ASEAN region, including Singapore. In the last week of November 2017, a monsoon surge brought widespread moderate to heavy monsoon rains and occasional windy conditions to north-eastern parts of Peninsular Malaysia.

9          During the month, Singapore experienced thundery showers mostly in the afternoon due to strong solar heating of land areas coupled with the convergence of winds over Singapore and the surrounding vicinity. There were several days when the occurrence of Sumatra squalls brought moderate to heavy thundery showers over many parts of Singapore between the predawn hours and morning.  The highest daily rainfall recorded for the month was 130.6mm in the East Coast area on 14 November 2017, when the passage of a Sumatra squall brought widespread heavy rain to the island. As at 29 November 2017, the Changi climate station recorded a total of 24 rain days[2] for November 2017, well above the long-term average of 18 rain days for November.

10        On most days during the month, the daily maximum temperatures ranged between 31°C and 33°C. There were however a few warm days with  daily maximum temperatures of around 34°C. At the Changi climate station, the monthly mean daily maximum temperature recorded for November 2017 (as of 29 November) was 30.8°C, which is 0.4°C lower than the long-term average daily maximum temperature for November.

11        Most parts of Singapore received well above normal rainfall in November 2017. The highest rainfall of 467.2mm (84% above average) was recorded around the Seletar area. Rainfall was lowest around the Choa Chu Kang area where 250mm (3% above average) was recorded.

[1] A rain day is defined as a day where 0.2mm of more of rain was recorded.

[2]  A monsoon surge refers to the strengthening of northeasterly winds blowing from a strong high-pressure system over the northern Asian continent toward the South China Sea, bringing periods of prolonged widespread rain and windy conditions to the surrounding region including Singapore and Peninsular Malaysia. (Further information is available at  https://www.weather.gov.sg/learn_weather_systems/).

CLIMATE STATION STATISTICS FOR December (Climatological reference period: 1981 – 2010)

Northeast Monsoon to arrive in late Nov’17, and last till Mar’18. Wet weather expected in the next fortnight.

Singapore, 16 November 2017 – In the second fortnight of November 2017, the prevailing inter-monsoon conditions are expected to transition to the Northeast Monsoon. The prevailing light and variable low level winds are forecast to gradually strengthen and blow predominantly from the northwest or northeast towards the end of the month. This marks the onset of the Northeast Monsoon season which is expected to extend till March 2018.

2          The wet weather conditions experienced in the first fortnight of the month are expected to persist in the second half of November 2017. During this period, moderate to heavy thundery showers are forecast mostly in the afternoon on six to eight days, and may extend into the evening on a few of these days. In addition, widespread thundery showers accompanied by gusty winds can be expected between the predawn and early morning on one or two days. November is normally the second wettest month of the year with December being the wettest. The rainfall for November 2017 is likely to be well-above average for most parts of Singapore.

3          The daily temperature on most days in the second half of November 2017 is forecast to range between 24°C and 33°C. There could be a few warm days in the last two weeks of November 2017 where the daily maximum temperature could reach a high of around 34°C. On a few days when rain is expected to fall over most parts of the day, the daily minimum temperature could reach a low of around 22°C.

4          For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, MSS’ Weather@SG app.

REVIEW (1 – 15 November 2017)

5          Inter-monsoon conditions prevailed over Singapore and the surrounding region in the first fortnight of November 2017. The low level winds during this period were generally light and variable in direction.

6          On most days in the past fortnight, there were moderate to heavy thundery showers in the afternoon due to strong solar heating of land areas. In addition, the passage of Sumatra squalls on several days brought widespread thundery showers with gusty winds to Singapore between the predawn hours and morning. In the first fortnight of November 2017, the highest daily rainfall of 130.6mm was recorded on 14 November 2017 around the East Coast area. This was due to the passage of an intense Sumatra squall over the island bringing widespread rain for most parts of the day.

7          During the first half of November 2017, the daily maximum temperature was between 28.5°C and 33.8°C, except for 15 November 2017 where the temperature reached a high of 34.1°C in the northern part of the island. The rainy weather during this period brought several days of cool night-time temperatures, with the daily minimum temperature ranging between 22.5°C and 24°C.

8          Most parts of Singapore received above normal rainfall in the first fortnight of November 2017. The highest rainfall of 382.2mm (190% above average) was recorded around the Seletar area. Rainfall was lowest around the Jurong area where 95.2mm (27% below average) was recorded.

CLIMATE STATION STATISTICS FOR November (Climatological reference period: 1981 – 2010)

Expect dry and warm conditions in first half of June 2017

Singapore, 1 June 2017 –   Southwest Monsoon conditions characterised by low level winds that blow predominantly from the southeast or southwest set in over Singapore in the second half of May 2017. The Southwest Monsoon season which extends from June to September is generally drier compared to other times of the year.

2         In the first fortnight of June 2017, the prevailing winds are forecast to blow from the southeast or southwest. During the period, Singapore can expect dry weather conditions on most days, and localised short-duration thundery showers due to strong solar heating of land areas are expected in the late morning and early afternoon on three or five days. In the latter half of the fortnight, thundery showers with gusty winds due to Sumatra squalls can be expected on one or two days between the predawn hours and early morning. Rainfall for the first fortnight of June 2017 is likely to be below-normal.

3         In the first half of June 2017, some warm days can be expected. On these days, the daily maximum temperature could reach a high of around 35°C, and the daily minimum temperature is expected to be around 26°C. On other days, the daily temperature is forecast to range between 25°C and 34°C.

4         For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, or the MSS’ Weather@SG app.

Review: 1 – 31 May 2017

5         In the second half of May 2017, the prevailing light and variable winds gradually strengthened to blow from the southeast or southwest as the region transitioned from the inter-monsoon period to the Southwest Monsoon season.

6         There were some warm days in May 2017. The highest daily maximum temperature was 35.0°C recorded at Choa Chu Kang on 31 May 2017[1]. On days when it rained, the lowest daily minimum temperature recorded ranged between 22.2°C and 22.9°C.  At the Changi climate station, the mean monthly temperature recorded in May 2017 was 28.4°C, approximately 0.1°C warmer than the long-term mean temperature for May.

7         In May 2017, Singapore experienced thundery showers in the late morning and early afternoon on most days due to convergence of winds over Singapore and the surrounding vicinity. On a few days of the month, the occurrence of Sumatra squalls brought widespread thundery showers to Singapore in the predawn and early morning. The thundery showers were heaviest on 31 May 2017 where the highest daily rainfall total recorded was 96.2mm around the Simei area.

8         Most parts of Singapore received above normal rainfall in May 2017. The highest rainfall of 303.7mm (58% above average) was recorded around the Paya Lebar area. Rainfall was lowest around the Kranji area where 172.2mm (19% below average) was recorded.

[1] Figure for highest daily maximum temperature for May was corrected on 16 Jun 2017

CLIMATE STATION STATISTICS FOR JUNE (Climatological reference period: 1981 – 2010)

Expect mostly afternoon thundery showers in the first half of January 2017

Singapore, 30 December 2016  – The current Northeast Monsoon conditions over the region are forecast to prevail into the first fortnight of 2017. During this period, the low level winds are forecast to blow mainly from the northeast or northwest.

2          The first fortnight of 2017 is expected to be less wet compared to the rainy weather in the past two weeks. Thundery showers are still expected mostly in the afternoon on five to seven days, and could extend into the evening on a few days. Widespread thundery showers accompanied by gusty winds can also be expected between the predawn and early morning on one or two days. The rainfall for the first half of January 2017 is forecast to be slightly below normal.

3          During the outlook period, the daily maximum temperature on most days is forecast to be around 32°C or 33°C. Some cooler nights are expected, with the daily minimum temperature ranging between 23°C and 24°C.

4          The year 2016 is set to be the hottest year on record in Singapore since temperature records started in 1929. The mean annual temperature recorded at the Changi climate station (as at 29 December 2016) is 28.4°C, exceeding the current record of 28.3°C set in 1997, 1998 and 2015. Temperatures soared in the first half of 2016 due to the effects of a very strong El Niño. The temperatures remained well above the long-term average for the rest of the year. New monthly records for the hottest January, April and August were set in 2016.

5          The annual total rainfall recorded at the Changi climate station (as at 29 December 2016) is 1954mm. This is higher than the 1267mm rainfall recorded in 2015 (the second lowest on record), and 10% below the long-term annual mean of 2166mm (based on reference period 1981-2010).

6         For updates of the daily weather and haze forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, MSS’ Weather@SG app.

Review: 1 – 29 December 2016

7          In December 2016, the region experienced Northeast Monsoon conditions where the low level winds were mostly blowing from the northwest or north.

8          The mean monthly temperature recorded at the Changi climate station (as at 29 December 2016) is 27.4°C, which is 0.3°C lower than the highest ever recorded mean December temperature set in 2015. December 2016 is on track to be the second hottest December on record.

9          Singapore experienced wetter weather conditions in the second half of December 2016 compared to the first half of the month. Most of the thundery showers occurred in the afternoon and evening due to strong solar heating of land areas coupled with convergence of winds in the surrounding vicinity. A high occurrence of Sumatra squalls during the month also brought moderate to heavy thundery showers to many parts of Singapore on several days in the pre-dawn hours and morning. The heaviest rain events occurred on 23 and 24 December 2016, where the highest daily rainfall of 98mm and 86mm was recorded over Bukit Panjang and Tai Seng respectively.

10        Almost all parts of Singapore received below normal rainfall in December 2016. The lowest rainfall of 116.4mm (55% below average) was recorded over the Jurong area. Rainfall was highest around Serangoon where 289.5mm (4% above average) was recorded.

CLIMATE STATION STATISTICS FOR JANUARY (Climatological reference period: 1981 – 2010)

Significantly below normal rainfall in first half of Dec 2016

Singapore, 16 December 2016 – Northeast Monsoon conditions are forecast to continue to prevail in the last fortnight of 2016. The low level winds during this period are forecast to blow mostly from the northwest or northeast. In addition, short-duration thundery showers, at times heavy, can be expected on seven to nine days, mostly between the late morning and afternoon.

2          On one or two days in the next fortnight, the presence of low pressure systems over the surrounding sea areas are expected to bring a shift in the low level winds to blow from the southwest or west. This could lead to the development of Sumatra squalls over the Strait of Malacca and bring widespread thundery showers accompanied by gusty winds to Singapore between the predawn and morning. The second half of December 2016 is expected to be wetter than the first fortnight of December 2016. Overall, the rainfall for December 2016 is forecast to be below normal.

3          Although December is one of the cooler months of the year, a few warm days can still be expected. In the next fortnight, the daily maximum temperatures on most days are forecast to be around 32°C or 33°C, and on a few days, the daily maximum temperature could reach a high of 34°C. On some rainy days, the daily minimum temperature could range between 22°C and 24°C.

4         For updates of the daily weather and haze forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), the haze microsite (www.haze.gov.sg) or download the myENV app, MSS’ Weather@SG app.

Review: 1 – 15 December 2016

5          Northeast Monsoon conditions prevailed over the region in the first fortnight of December 2016. While the low level winds blew from the northwest on most days, there were some days when the winds were from the southwest or west due to the influence of Tropical Cyclones “Vardah” and “Nada” over the Bay of Bengal.

6          There were a few warm days in the first two weeks of December 2016 where the daily maximum temperature was between 34°C and 35°C. At the Changi climate station, the mean daily maximum temperature recorded in the first half of December 2016 was 31.8°C, which is 1.6°C above the long-term mean for December. In addition, the mean monthly temperature recorded was 27.8°C, which is 1.4°C warmer than the long-term mean for December.

7          In the first fortnight of December 2016, most of the thundery showers over the island occurred between midnight and 6am. These were due to Sumatra squalls moving across the island, coupled with strong convergence of winds in the surrounding vicinity. In addition, there were a few days of moderate to heavy rainfall over Singapore between the late afternoon and evening due to strong solar heating of land areas. During the period, the heaviest daily rainfall of 45.4mm was recorded on 1 December 2016 around Tuas.

8          For the period from 1 to 15 December 2016, rainfall across Singapore was significantly below normal. The highest rainfall of 128mm (18% below average) was recorded around Changi. Rainfall was lowest around Jurong where 25.2mm (81% below average) was recorded.

CLIMATE STATION STATISTICS FOR DECEMBER (Climatological reference period: 1981 – 2010)

Expect some warm days in the next fortnight

Singapore, 17 October 2016 – The prevailing Southwest Monsoon is expected to weaken toward the end of October 2016 as the region enters the Inter-Monsoon period. During the coming two weeks, the low level winds are forecast to blow from the southwest before becoming light and variable in direction towards end of the month. Inter-Monsoon conditions are characterised by light and variable winds in the surrounding region.

2        In the second fortnight of October 2016, short-duration thundery showers can be expected on four to six days, mostly in the late morning and early afternoon. In addition, widespread thundery showers with occasional gusty winds are forecast on two or three days between the pre-dawn hours and morning. Rainfall for October 2016 is expected to be slightly below normal.

3        During the period, the maximum daily temperature on most days is forecast to be around 33 or 34°C, and on a few days could reach a high of around 35°C. Warmer conditions are common during the Inter-Monsoon season when there is strong solar heating and the winds are generally light.

4        For updates of the daily weather and haze forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), the haze microsite (www.haze.gov.sg) or download the myENV app, MSS’ Weather@SG app.

REVIEW: 1 – 16 October 2016

5         In the first fortnight of October 2016, Southwest Monsoon conditions prevailed over the region with the low level winds blowing predominantly from the west, and occasionally from the southwest. The prevailing winds during the review period were partly influenced by the presence of tropical storms in the northwestern Pacific Ocean and northern South China Sea.

6        Singapore experienced a few warm days in the first two weeks of October 2016. At the Changi climate station, the highest daily maximum temperature recorded was 34.6°C (on 11 October 2016). This record ties with the highest ever recorded daily maximum temperature for October (on 29 October 2002). As of 16 October 2016, the mean monthly temperature for October 2016 was 28.8°C, 1.2°C warmer than the long-term mean for October.

7        During the review period, Singapore’s rainfall on most days were from an eastward moving line of thunderstorms known as Sumatra squalls that developed over the western coast of Sumatra or the Strait of Malacca overnight. On the other days that rained, the thundery showers in the late morning and early afternoon were due to strong solar heating of land areas. Rainfall was heaviest on 3 October 2016 over the Buona Vista area where a total of 96.8mm of rainfall was recorded.

8       For the first fortnight of October 2016, rainfall was below average in the northwestern half of Singapore, and above average in the southeastern half of the island. The highest rainfall of 139.2mm (53% above average) was recorded around the Tanjong Katong area. Rainfall was lowest in the western part of the island around the Choa Chu Kang area where 65.8mm (39% below average) was recorded.

CLIMATE STATION STATISTICS FOR OCTOBER (Climatological reference period: 1981 – 2010)

New climate station temperature record for September

Singapore, 30 September 2016 – Southwest Monsoon conditions are forecast to continue into the first half of October 2016. The low level winds are expected to blow from the southwest or west and gradually become light and variable in direction towards the end of the outlook period.

2.       During the first half of October 2016, short-duration thundery showers are expected on four to six days mostly in the late morning and afternoon. In addition, widespread thundery showers with occasional gusty winds due to squall lines moving eastwards from the Strait of Malacca, are expected on two or three days between the pre-dawn hours and morning. Rainfall for the first fortnight of October 2016 is expected to be slightly below normal.

3.       The warm temperatures experienced in the last week of September 2016 can still be expected on a few days in the first two weeks of October 2016. During this period, the daily maximum temperatures are forecast to range between 33°C and 34°C on most days and could reach a high of around 35°C on a few days.

4        For updates of the daily weather and haze forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), the haze microsite (www.haze.gov.sg) or download the myENV app, MSS’ Weather@SG app.

REVIEW: 1 – 29 September 2016

5          In September 2016, Southwest Monsoon conditions prevailed over the region with the low level winds blowing predominantly from the southwest or west.

6          During the month, Singapore experienced a few warm days, in particular in the last week of the month. At the Changi climate station, the daily maximum temperature recorded on 29 September 2016 was 34.4°C, which exceeds the highest ever recorded daily maximum temperature of 34.3°C (on 15 September 2000) for September.

7          During the review period, lines of thunderstorms or squalls that moved eastwards from the Strait of Malacca brought widespread thundery showers accompanied by gusty winds to Singapore on several days mostly between the early hours and predawn. On a few days, thundery showers due to strong solar heating of land areas affected Singapore mostly in the late morning and early afternoon. Rainfall was heaviest on 14 September 2016 over the Paya Lebar-Macpherson area where a total of 86.6mm of rainfall was recorded.

8          Most parts of Singapore received slightly below normal rainfall in September 2016. The highest rainfall of 216.4mm (23% above average) was recorded around the Telok Blangah area. Rainfall was lowest around Mandai where 86.4mm (57% below average) was recorded.

CLIMATE STATION STATISTICS FOR OCTOBER (Climatological reference period: 1981 – 2010)