Singapore
Singapore
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Singapore, Singapore

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The colorful night skyline of Singapore city in Singapore, a beautiful view of the skyscrapers against the bright sky
The colorful night skyline of Singapore city in Singapore, a beautiful view of the skyscrapers against the bright sky
September begins the retreat of the southwest monsoon as the rain averages about 154.9mm (6.1") in the month with heat still around and the average temperatures in the 24.4°C (75.9°F) to 31.1°C (88°F) steady range.
Afternoon thunderstorms diminish in regularity and intensity with a corresponding drop in the rainfall. It is mostly cloudy with the sun on the horizon for only 5 hours a day, but there is adequate daylight as the days on the equator last for 12 hours.

The Mid-Autumn Festival in late September, also known as the Lantern or Moon-Cake Festival celebrates the arrival of better weather and the traditional harvest season while the Hungry Ghost Festival is a traditional Chinese Festival to satiate the spirits of deceased relatives during the seventh lunar month. For people who cannot withstand large crowds, it is a good idea to avoid September as Singapore sees an influx of visitors during this time.
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  • The average high temperature in September: 30.9°C

The warmest month (with the highest average high temperature) is April (31.7°C).
The month with the lowest average high temperature is December (30°C).

  • The average low temperature in September: 24.2°C

Months with the highest average low temperature are May and June (24.8°C).
The coldest month (with the lowest average low temperature) is January (23.3°C).

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  • The average humidity in September: 83.4%

The month with the highest relative humidity is December (86.9%).
Months with the lowest relative humidity are February and July (82.8%).

  • The average rainfall in September: 169.2mm

The wettest month (with the highest rainfall) is December (287.4mm).
The driest month (with the lowest rainfall) is July (158.7mm).

  • The average rainfall days in September: 14 days

Months with the highest number of rainy days are November and December (19 days).
The month with the lowest number of rainy days is February (11 days).

  • The average sea temperature in September: 29.4°C

Best months for swimming (with the highest average sea temperature) are May and June (30.2°C).
The coldest month (with the lowest average sea temperature) is January (27.7°C).

  • The average daylight in September: 12h

Months with the longest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12h).
Months with shortest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12h).

  • The average sunshine in September: 5.2h

The month with most sunshine is February (Average sunshine: 6.5h).
Months with least sunshine are November and December (Average sunshine: 4.3).

  • The average UV index in September: 12

Months with the highest UV index are January, February, March, April, May, August, September, October, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 11).

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