Forecast

WEATHER OUTLOOK (1 – 15 September 2026)

1    Dry conditions are expected to continue into the first fortnight of September 2026. Southwest Monsoon conditions are prevailing over Singapore and the surrounding region and are forecast to persist in the coming fortnight, with winds blowing mainly from the southeast or southwest.

2    Fair and occasionally windy conditions are expected on most days, particularly during the first week of September 2026. Localised short-duration thundery showers may occur over parts of the island in the late morning and afternoon on a few days. The total rainfall for the first fortnight of September 2026 is forecast to be below average over most parts of the island.

3    Daily maximum temperatures are likely to range between 33 degrees Celsius and 35 degrees Celsius on most days, and could slightly exceed 35 degrees Celsius on a few days. The nights may also be warm and humid, with minimum temperatures remaining above 27 degrees Celsius on most nights.

4    With the prevailing dry conditions, there has been an escalation in the hotspot and smoke haze situation in the surrounding region. Dense smoke haze was observed over southern and central Sumatra and various parts of Kalimantan on most days since around 21 August 2026. While there may be sporadic showers in the second week of the fortnight, the dry conditions are expected to persist over most of the surrounding region during the fortnight. Under the prevailing southeasterly or southwesterly winds, Singapore may experience hazy conditions should the fires intensify. The National Environment Agency (NEA) will continue to closely monitor the situation and provide updates if the situation changes. Should the 24-hour PSI enter the Unhealthy range, NEA will provide daily haze advisories.

5    For updates of the daily weather forecast, please visit the MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW OF THE PAST TWO WEEKS (17 – 31 August 2026)

6    Southwest Monsoon conditions prevailed over Singapore and the surrounding region in the second fortnight of August 2026, with winds blowing mostly from the southeast or southwest.

7    Singapore experienced dry conditions in the second fortnight of August 2026, with fair weather on most days. Localised short-duration thundery showers fell over parts of the island on some days. On 30 August 2026, regional wind convergence brought moderate to heavy thundery showers over the eastern, southern, and central parts of Singapore in the early morning. The highest daily total rainfall for the second fortnight of August 2026 was recorded around Telok Blangah on that day, at 53.8mm.

8    The second fortnight of August 2026 was warm, with daily maximum temperatures exceeding 34 degrees Celsius on most days. The highest daily maximum temperature of 35.5 degrees Celsius was recorded at Seletar on 25 August 2026. There were also several nights when minimum temperatures remained above 27 degrees Celsius.

9    Singapore recorded well below average rainfall in the second fortnight of August 2026. The area around Admiralty registered rainfall of about 99 per cent below average.

CLIMATE STATION STATISTICS

Long-term Statistics for September
(Climatological reference period: 1991 – 2020)

Historical Extremes for September
(Rainfall since 1869 and temperature since 1929)