Short-duration thundery showers on some days
Singapore, 16 September 2015 – Southwest Monsoon conditions are forecast to prevail with low level winds blowing predominantly from southeast or south-southwest.
2. In the second fortnight of September 2015, short duration thundery showers are likely on 3 to 5 days, mostly in the late morning and early afternoon. In addition, thundery showers with gusty winds due to Sumatra squalls can be expected on 1 or 2 days in the pre-dawn hours and early morning. Maximum temperatures of around 34 degrees Celsius can be expected on a few days.
3. As dry weather conditions are expected to persist in the region, Singapore could experience hazy conditions on some days if unfavourable winds blow in smoke haze from the surrounding region.
4. The rainfall for September 2015 is expected to be below normal.
Review of 1 – 15 September 2015
5. Southwest Monsoon conditions prevailed in the first fortnight of September 2015. During the period, the low level winds blew from the southeast or southwest.
6. In the first fortnight of September 2015, Singapore experienced hazy conditions due to smoke haze from fires in Sumatra that were blown in by the prevailing south to southwesterly winds. Thundery showers affected the island between the late morning and early afternoon on a few days. The highest daily total rainfall recorded for the period was 80mm on 9 September 2015 in the western part of Singapore around Chua Chu Kang. In the first two weeks of September 2015, the highest daily maximum temperature recorded ranged between 34.2 and 34.7 degrees Celsius, and on a few wet days, the lowest daily minimum temperature recorded was between 22.4 and 22.7 degrees Celsius.
7. During the review period, most parts of Singapore received below average rainfall. The lowest rainfall of 10mm and 34mm (60 to 90% below average) was recorded over the northern and central parts of Singapore around Yishun and Serangoon. Rainfall was highest over the western part the island around Jurong and Tuas, where 111mm to 171mm (60 to 90% above average) of rain was recorded.
STATISTICS FOR SEPTEMBER since 1869 (CLIMATE STATION)
Average rainfall for the month — 168.8 mm
Highest rainfall ever recorded — 440.4 mm (1988)
Lowest rainfall ever recorded — 23.7 mm (1994)
Average number of rain days — 14
Average daily maximum temperature — 30.9 degrees Celsius
Average daily minimum temperature — 24.3 degrees Celsius
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