Short-duration thundery showers and Sumatra squalls mostly in first half of coming fortnight; Dry and warm conditions in the 2nd week of month with warm temperatures of up to 35°C expected on some days.
Fortnightly Weather Outlook for 1 – 15 July 2019
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.
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)
|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 temperature:||32.4 °C (1997)|
|Lowest monthly mean temperature:||22.9 °C (1975)|
|Highest rainfall ever recorded:||527.3 mm (1890)|
|Lowest rainfall ever recorded:||18.6 mm (1997)|