Dry and Warm Conditions to Persist for Rest of July 2018

Dry and warm conditions to continue for rest of July 2018. Expect 3-5 days of short-duration thundery showers between late morning and early afternoon, and 1 or 2 days of widespread thundery showers between predawn and early morning.

Singapore, 16 July 2018 – The prevailing Southwest Monsoon conditions are forecast to persist in the second half of July 2018, and continue into September/early October 2018. During this period, the low level winds over Singapore and the surrounding region are expected to blow mostly from the southeast or southwest, and on brief occasions, to blow from the west.

2         The dry and warm weather conditions that were experienced over the southern parts of Southeast Asia, including Singapore in the first half of July 2018 are forecast to persist on most days for the rest of month. During the second fortnight of July 2018, the daily temperatures are expected to range between 24°C to 34°C. On days with little or no rain, the daily maximum temperature could reach a high of around 35°C.

3         In the next two weeks, short-duration thundery showers can still be expected on three to five days, mainly in the late morning and early afternoon. On one or two days during the period, the passage of a Sumatra squall from the Strait of Malacca to the South China Sea could bring widespread thundery showers and gusty winds over the island between the predawn hours and early morning. Overall, the rainfall for July 2018 is expected to be below normal over many parts of Singapore.

4         For updates of the daily weather forecast, please visit our MSS website (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 2018)

5       In the first half of July 2018, Southwest Monsoon conditions prevailed over the region with low level winds blowing predominantly from the southeast or southwest.

6         Compared to the last fortnight of June 2018, the first fortnight of July 2018 received less rainfall due to stable atmospheric conditions that prevailed over the southern Southeast Asia region. This brought dry and warm weather conditions on most days during the first half of July 2018. The thundery showers experienced over parts of the island in the first two weeks of the month were due to strong solar heating of land areas coupled with convergence of winds in the surrounding vicinity on some days, and to the passage of the Sumatra squalls over Singapore as it moved east towards the South China Sea on a few mornings. The highest daily total rainfall recorded in July 2018 was 78.4mm on 7 July 2018 around Punggol. Strong daytime heating of land areas on 7 July 2018 brought intense thundery showers over the northern and eastern parts of Singapore in the late afternoon and evening.

7         In the first fortnight of July 2018, the daily maximum temperatures ranged between 29°C and 33°C on most days. The highest daily maximum temperature recorded during the fortnight was 34.4°C on 12 July 2018. The daily minimum temperature was around 24°C but fell below 22°C on a few occasions during intense thunderstorms.

8         About two-thirds of Singapore received below normal rainfall in the first fortnight of July 2018. The lowest rainfall of 15.2 mm (84% below average) was recorded at Queenstown. Rainfall was highest at Changi where 124.2 mm (67% above average) was recorded.


FWO 16 Jul

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

Mean daily maximum temperature 31.3 °C
Mean daily minimum temperature 25.0 °C
Mean monthly temperature 27.9 °C
Mean rainfall for the month 154.4 mm
Mean number of rain days 14
Highest monthly mean daily maximum temperature 32.4 °C (1997)
Lowest monthly mean daily minimum temperature 23.8 °C (1981)
Highest monthly rainfall 305.4 mm (1988)
Lowest monthly rainfall 18.6 mm (1997)