- Fortnightly Outlook
Fortnightly Weather Outlook for 1 – 15 July 2020
WEATHER OUTLOOK (1 – 15 July 2020)
1 The wet weather in the last fortnight of June 2020 is forecast to continue into the first half of July 2020. During this period, the daily maximum temperature is expected to range between 32°C and 33°C with daily highs of around 34°C on a few days.
2 With the prevailing Southwest Monsoon persisting in July 2020, the low-level winds over Singapore and the surrounding region are forecast to blow mostly from the southeast or southwest, and to blow from the east on a few days.
3 Over the next two weeks, the monsoon rain band is forecast to remain over the equatorial Southeast Asia region. On most days during the period, short-duration moderate to heavy thundery showers can be expected between the late morning and afternoon over parts of the island. On one or two of these days, the thundery showers could extend into the evening. Towards the latter part of the fortnight, convergence of winds in the surrounding vicinity is expected to bring Sumatra squalls with widespread thundery showers between predawn and morning on one to two days. In addition, thundery showers are forecast on a few nights. Overall, the rainfall for the first half of July 2020 is forecast to be above-average over most parts of the island.
4 During the fortnight, the daily temperature on most days is forecast to range between 24°C and 33°C, and could reach around 34°C on a few days. The daily minimum temperature could drop to a low of around 23°C on some 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 – 30 June 2020)
6 Southwest Monsoon conditions prevailed in June 2020. During the period, the low-level winds blew from the southeast or southwest on most days, and from the west on some days.
7 June 2020 was a relatively wet month, with more rain falling in the second half of the month than the first half. Most of the moderate to heavy thundery showers occurred in the afternoon due to strong solar heating of land areas. On a few of these days, the showers extended into the evening. There were thundery showers on several nights due to large-scale convergence of winds in the surrounding region. The wet weather in June 2020 was also due to the passage of Sumatra squalls over Singapore on some days. The squalls brought widespread thundery showers and gusty winds between the early and predawn hours. On 23 June 2020, moderate to heavy thundery showers fell over the island in the morning. The daily total rainfall of 155.9mm recorded at Bukit Batok that day was the highest daily total for June 2020.
8 The first half of June 2020 was generally warmer compared to the second half of the month. There were more days in the early half of June 2020 where daily maximum temperatures of 34°C or more were recorded. The highest daily maximum temperature of 35.6°C was recorded at Admiralty on 2 June 2020. There were also a few warm nights where the night-time temperature was around 28°C mostly over the coastal areas of the island. The rainy weather in the second half of June 2020 brought cooler conditions across the island. The daily maximum temperature ranged between 28.6°C and 33.4°C in the second half of the month.
9 With a monthly total rainfall of 233.8mm recorded at the Changi climate station, June 2020 is the wettest June in the last 10 years, exceeding the 213mm recorded in June 2011. June 2020 is also the coolest June in the last 20 years, with a monthly mean temperature of 28.1°C, 0.2°C lower than the long-term June average. This ends the record 28 consecutive months of above-average monthly temperatures since February 2018.
10 Singapore received well above average rainfall in June 2020. The highest anomaly of 212% above average was recorded at Tanjong Katong. The anomaly was lowest at Admiralty at 5% 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)|