Monthly Archives: July 2019

Singapore, 16 July 2019 – The Southwest Monsoon conditions that have been prevailing over Singapore and the surrounding region since early June 2019 are forecast to continue for the rest of July 2019, and persist until October 2019. During this period, the low level winds are forecast to blow from the southeast or southwest.

2          In the second fortnight of July 2019, the monsoon rain band is forecast to lie over northern Southeast Asia and the northern South China Sea. This is expected to bring generally dry and occasionally windy conditions to Singapore and the surrounding region in the first week of the fortnight. Despite the drier conditions, there could still be a few days of localised short-duration showers at times with thunder over a few areas of the island in the late morning and early afternoon.

3          More rain can be expected in the later part of July 2019. Periods of widespread thundery showers, at times heavy can be expected on two or three days due to large scale wind convergence over Singapore and the surrounding region. In addition, there could be a few days of localised short-duration thundery showers in the late morning and early afternoon. Overall, the rainfall for July 2019 is likely to be slightly below normal.

4          In the second fortnight of July 2019, the daily temperature over Singapore is forecast to range between 25°C and 33°C. The daily maximum temperature could reach a high of around 34°C on some days. On some nights, warm and humid conditions with night-time temperatures of around 28°C are expected, in particular when prevailing winds blowing from the southeast bring warm and humid air from the sea.

5         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 – 15 July 2019)

6          Southwest Monsoon conditions prevailed in the first fortnight of July 2019, and the low level winds were blowing mostly from the southeast or southwest.

7          During the first half of July 2019, Singapore experienced short-duration thundery showers in the late morning and afternoon due to strong solar heating of land areas and large-scale convergence of winds in the surrounding vicinity. Most of the showers fell in the first half of the fortnight. The thundery showers that fell over many areas of the island on 8 July 2019 recorded a daily total rainfall of 51.6mm at Mandai. This was the highest daily total rainfall for July 2019 (as of 15 July 2019).

8          There were several warm days in the first fortnight of July 2019. The daily maximum temperature ranged between 31.1°C and 34.5°C, with the highest daily maximum temperature of 34.5°C recorded at Pulau Ubin on 6 July 2019. There were also a few warm nights where the night-time temperature hovered around 28°C, especially over the southeastern part of the island. The warm nights were due to warm and humid air blown in from the sea by the prevailing southeasterly winds.

9          Below-average rainfall was recorded over many parts of the island in the first fortnight of July 2019. The lowest anomaly of 94% below-average was recorded at Changi.

CLIMATE STATION STATISTICS

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

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

Short-duration thundery showers and Sumatra squalls mostly in first half of coming fortnight; Dry and warm conditions in the 2^nd week of month with warm temperatures of up to 35°C expected on some days.

Singapore, 1 July 2019 – The prevailing Southwest Monsoon conditions are expected to persist over Singapore and the surrounding region in the first fortnight of July 2019. During the period, the low level winds are forecast to blow from the southeast or southwest.

2          For the fortnight, showers are forecast mostly in the first week of July 2019. Short-duration thundery showers in the late morning and early afternoon are expected on three to five days. On two or three days, Sumatra squalls moving over the island could bring widespread thundery showers and gusty winds in the morning. Overall, the rainfall for the first fortnight of July 2019 is likely to be near-normal across the island.

3          During the first half of the month, the monsoon rain band is forecast to gradually shift further north away from the Equator, and a transition to drier conditions in the region can be expected in the next few weeks. For Singapore, the showers in the first week are forecast to ease, and dry and warm weather are expected in the second week of the month.

4          The daily temperature on most days in the coming fortnight is forecast to range between 25°C and 34°C, and the daily maximum temperature could reach a high of 35°C on some days. On some nights, minimum night-time temperatures of around 28°C can be expected, especially when the prevailing winds blow from the southeast and bring in warm and humid air from the sea.

5          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 – 30 June 2019)

6         In June 2019, Southwest Monsoon conditions prevailed over Singapore and the surrounding region, and the low level wind blew from the southeast or southwest.

7          June 2019 was a relatively wet month. Thundery showers fell over the island mostly between the late morning and afternoon on more than three-quarters of the month. The wet weather was due to the presence of the monsoon rain band over the equatorial region, the large-scale wind convergence over the surrounding region and/or the passage of the Madden-Julian Oscillation (MJO). In particular, on 3 June 2019, the widespread thundery showers that fell in the late morning and early afternoon recorded a rainfall total of 102.8mm at Bukit Merah. On 21 June 2019, the localised moderate to heavy thundery showers that fell over the eastern part of Singapore recorded a daily rainfall total of 137.7mm (at Changi). This was the highest daily total rainfall recorded for June 2019.

8          The wet weather in June 2019 also brought slightly cooler days to Singapore compared to May 2019. The mean daily maximum temperature of 31.3°C in June 2019 was 0.7°C below the long term mean for June. The daily maximum temperature in June 2019 ranged between 28.2°C and 33.9°C. The highest daily maximum temperature of 33.9°C was recorded at Choa Chu Kang and Pulau Ubin on 11 June 2019, and at Paya Lebar on 20 June 2019. There were a few warm nights in June 2019 where the minimum night-time temperature was around 28°C. This was due to prevailing winds blowing from the southeast that brought in warm and humid air from the sea.

9          Well above-average rainfall was received across the island in the first fortnight of June 2019. The highest anomaly of 92% above-average was at Jurong West. The anomaly was lowest at Admiralty at 7% below-average.

CLIMATE STATION STATISTICS

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

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