Monthly Archives: September 2020

Singapore, 16 September 2020 – The weather for the second half of September 2020 is forecast to be less wet with a few warm days compared to the first fortnight of the month. The daily temperature is expected to range between 25°C and 33°C on most days and may reach a high of around 34°C on a few days.

2         In the coming fortnight, Southwest Monsoon conditions are expected to persist. The low-level winds are forecast to weaken but continue to blow from the southeast or southwest. The winds may shift to blow from the west on one or two days.

3          In the next two weeks, the monsoon rain band is forecast to remain over the equatorial Southeast Asia region. Short-duration moderate to heavy thundery showers can be expected over parts of the island between the late morning and afternoon on most days, and may extend into the evening on one or two days. The passage of Sumatra squalls may bring widespread thundery showers with occasional gusty winds in the morning on a few days. While rainfall in the coming fortnight is expected to be lower than that in the first fortnight of the month, the overall rainfall for September 2020 is expected to be well above-average over most parts of the island.

4          On most days in the coming fortnight, the daily temperature is forecast to range between 25°C and 33°C. A few warm days are expected with daily highs reaching around 34°C. Some nights can be relatively warm with night-time temperatures hovering around 28°C, particularly  when the prevailing southeast winds blow warm and humid air from the sea toward the land.

5         For updates of the daily weather and haze situation, 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, and the haze microsite (www.haze.gov.sg).

REVIEW (1 – 15 September 2020)

6        In the first fortnight of September 2020, Southwest Monsoon conditions prevailed over the region. During this period, the low-level winds blew from the southeast or southwest.

7       The first fortnight of September 2020 was wet and occasionally windy. Thundery showers fell between the late morning and afternoon on most days, and extended into the evening on a few of these days. There were also a few days where thundery showers fell during the night and in the early morning. The widespread moderate to heavy thundery showers with occasional gusty winds on some days were due to large-scale convergence of winds over Singapore and the surrounding vicinity. The showers were heaviest on the morning of 10 September 2020. The daily total rainfall recorded that day was 129.6mm at Tuas South, which is the highest recorded for the first fortnight of September 2020.

8        The wet weather in the first fortnight of September 2020 brought cooler conditions on some days, mostly in the latter half of the fortnight. The lowest daily maximum temperature  during the period was 28.3°C recorded at East Coast and at Sembawang on 5 and 13 September 2020 respectively. Both days were associated with island-wide heavy thundery showers and cloudy skies, and with minimum temperatures  between 22.0°C and 23.0°C. The lowest daily minimum temperature recorded during the first fortnight of September was 21.8°C at Paya Lebar on 15 September 2020.

9         Almost all parts of the island received well above-normal rainfall in the first half of September 2020. The highest anomaly of 188% above average was recorded at Tanjong Katong. The anomaly was lowest at Admiralty at 8% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for September
(Climatological reference period: 1981 – 2010)

Historical Extremes for September
(Rainfall since 1869 and temperature since 1929)

Singapore, 1 September 2020 –  The weather in the first half of September 2020 is expected to be similar to that in the last fortnight of August 2020, with thundery showers and humid conditions forecast on most days. In the next fortnight, the daily maximum temperature is forecast to range between 32°C and 33°, and with daily highs of around 34°C on a few days. Toward the second week of September 2020, warm weather can be expected on some nights.

2          The prevailing Southwest Monsoon conditions in the region are forecast to persist in the first fortnight of September 2020. During the period, the low-level winds are expected to blow from the southeast or southwest, and may on brief occasions, blow from the west.

3          In the first fortnight of the month, the monsoon rain band is expected to lie close to the equatorial Southeast Asia region. For Singapore, short-duration moderate to heavy thundery showers are forecast over parts of the island between the late morning and afternoon on most days. In addition, widespread thundery showers with gusty winds due to the passage of Sumatra squalls are expected on one or two mornings. The total rainfall in the first fortnight of September 2020 is forecast to be above-average over most parts of the island.

4          Despite showers falling over the island on most days in the fortnight, it can still be warm on a few days where the daily maximum temperature could reach around 34°C. On most days, the daily temperature is forecast to range between 25°C and 33°C. Toward the second week of the month, the weather on some nights can be warm and humid with night-time temperatures around 28°C. This occurs when the prevailing southeast winds strengthen and blow warm, humid air from the sea over the land.

5         For updates of the daily weather and haze situation, 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, and the haze microsite (www.haze.gov.sg).

REVIEW (1 – 31 August 2020)

6         In August 2020, Southwest Monsoon conditions prevailed over the region with the low-level winds blowing from the southeast or southwest. Under the influence of a few tropical storms over the South China Sea and the northwestern Pacific Ocean, the prevailing winds strengthened and blew from the west on some days.

7          With the monsoon rain band situated over the equatorial region in the latter half of August 2020, more rain fell over Singapore in the second fortnight compared to the first fortnight of the month.  Moderate to heavy thundery showers due to strong solar heating of land areas fell over the island in the late morning and afternoon on most days and extended into the evening on a few days. There were a few mornings where the passage of Sumatra squalls brought widespread thundery showers with gusty winds to Singapore. On 13 August 2020, moderate to heavy thundery showers fell over the island in the morning. The daily total rainfall of 115.6mm recorded at Bedok South that day was the highest total rainfall recorded for the month.

8          In August 2020, there were several dry and warm days, mostly in the first half of the month, where the daily maximum temperature was above 34°C. The highest daily maximum temperature of 35.4°C was recorded at Admiralty on 9 August 2020.  There were also several nights that were warm with night-time temperatures above 28°C, particularly over the southern, eastern and western coastal areas of the island. More rain fell over the island in the second half of August 2020. During this period, it was relatively cooler compared to the first half of the month, and the daily maximum temperature was below 33°C on nine days. At the Changi climate station, the mean monthly temperature for August 2020 was 28.3°C, 0.4°C higher than the month’s long-term average.

9          About one-third of the island recorded above-normal rainfall in August 2020. The rainfall recorded over Jurong area was 54% above-average, while that recorded at Admiralty was 42% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for September
(Climatological reference period: 1981 – 2010)

Historical Extremes for September
(Rainfall since 1869 and temperature since 1929)