Fortnightly Weather Outlook for 16 – 31 July 2020
Singapore, 16 July 2020 – More thundery showers can be expected in the second fortnight of July 2020. During this period, daily minimum temperatures of around 22°C can be expected on a few days. The daily maximum temperature is forecast to range between 32°C and 33°C on most days and a high of 34°C can be reached on one or two days.
2 In the coming fortnight, the prevailing Southwest Monsoon conditions are forecast to persist, with low-level winds blowing from the southeast or southwest. On a few days in the last week of July 2020, the winds are forecast to blow from the west.
3 The monsoon rain band is forecast to remain over the equatorial Southeast Asia region in the next two weeks. This is expected to bring short-duration moderate to heavy thundery showers between the late morning and afternoon on many days, and may extend into the evening on a few of these days. Thundery showers are also expected on a few nights due to the presence of large-scale wind convergence over Singapore and the surrounding vicinity. In addition, the passage of Sumatra squalls is expected to bring widespread thundery showers with gusty winds over the island in the morning on one or two days in the last week of the month. The second half of July 2020 is expected to see more rainfall than the past fortnight, and the overall rainfall for July 2020 is forecast to be above-average over most parts of Singapore.
4 During the fortnight, the daily temperature is forecast to range between 24°C and 33°C. Although showers are expected on many days during this period, the daily maximum temperature could still reach a high of around 34°C on one or two days. Lows of around 22°C can be expected on a few rainy days.
5 For updates of the daily weather and haze situation, please visit the MSS website (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 July 2020)
6 In the first fortnight of July 2020, Southwest Monsoon conditions prevailed over Singapore and the surrounding region. During the period, the low-level winds blew mostly from the southeast or southwest, and from the west on a few days.
7 In the first two weeks of July 2020, thundery showers fell over parts of the island mostly in the late morning and early afternoon due to strong solar heating of land areas. On a few days, the showers continued into the evening and night due to large-scale convergence of winds in the surrounding region. The highest daily total rainfall recorded in the first fortnight of July 2020 was 125.6mm at Buona Vista on 9 July 2020.
8 The second week of July was cooler compared to the first week due to more rainy weather. The lowest daily maximum temperature recorded was 25.9°C at Khatib on 13 July 2020 arising from overcast skies and widespread thundery showers that day. The highest daily maximum temperature in the first half of the month was 33.9°C recorded at Pulau Ubin on 5 July 2020.
9 About half of the island recorded above-normal rainfall in the first half of July 2020. The rainfall recorded at Jurong Pier was 90% above average while that recorded at Changi was 48% below average.
CLIMATE STATION STATISTICS
Long-term Statistics for July
(Climatological reference period: 1981 – 2010)
|Average daily maximum temperature||31.3°C|
|Average daily minimum temperature||25.0 °C|
|Average monthly temperature||27.9 °C|
|Average rainfall||154.4 mm|
|Average number of rain days||14|
Historical Extremes for July
(Rainfall since 1869 and temperature since 1929)
|Highest monthly mean daily maximum temperature:||32.4 °C (1997)|
|Lowest monthly mean daily minimum temperature:||22.9 °C (1975)|
|Highest monthly rainfall ever recorded:||527.3 mm (1890)|
|Lowest monthly rainfall ever recorded:||18.6 mm (1997)|