Expect Mainly Short-Duration Thundery Showers in The Second Half of July

Below-normal rainfall forecast for the month


Singapore, 15 July 2015 – Southwest Monsoon conditions are forecast to prevail during the next fortnight, with surface winds blowing predominately from the southeast or southwest.

2.     In the second fortnight of July 2015, short-duration thundery showers due to strong solar heating of land areas are forecast on 4 to 6 days in the late morning and afternoon. Daily maximum temperatures of up to about 33 degrees Celsius are forecast on some days during this period. In addition, thundery showers with gusty winds due to Sumatra squalls are likely on 1 to 2 days in the pre-dawn and morning. Slightly hazy conditions can also be expected on a few days, in particular in the early morning, due to the accumulation of particulate matter under light wind conditions.

3.    Rainfall for July 2015 is expected to be below-normal.

Review of 1 – 14 July 2015

4.    Southwest Monsoon conditions prevailed during the first fortnight of July 2015, with the surface winds blowing predominantly from the south-southeast or southwest.

5.    In the first fortnight of July 2015, there were a few warm days with the daily maximum temperature reaching up to 34.6 degrees Celsius, as well as some wet days where the daily minimum temperatures fell to between 22 and 23 degree Celsius. On several days in the second week of July 2015, Singapore experienced thundery showers with gusty winds in the morning due to the passage of Sumatra squalls. On 10 July 2015, Singapore was briefly affected by slight haze due to a change in the prevailing winds to blow from the southwest which could have brought in some smoke haze from fires in the nearby region.

6.    For the first half of July 2015, the southern and western parts of Singapore received below average rainfall. The highest rainfall of 110 mm and 130 mm (50% to 75% above average) were recorded over the central and eastern parts of the island around Lower Peirce Reservoir and Changi respectively. The lowest rainfall of 25 mm to 45 mm (40% to 65% below average) was recorded over the western parts of Singapore around Jurong.



Average rainfall for the month — 158.6 mm
Highest rainfall ever recorded — 527.3 mm (1890)
Lowest rainfall ever recorded — 18.6 mm (1997)
Average number of rain days — 13
Average daily maximum temperature — 30.9 degrees Celsius
Average daily minimum temperature — 24.6 degrees Celsius

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