September weather forecast and climate
Singapore, Singapore

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 154.9mm (6.1") during the month with the 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, 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.

What is the temperature in September in Singapore?

The average high-temperature, in September, in Singapore, Singapore, is 30.9°C (87.6°F), while the average low-temperature is 24.2°C (75.6°F).

What is the average humidity in September in Singapore?

The average relative humidity in September is 83.4%.

How many days does it rain in September in Singapore?

In Singapore, in September, during 14 rainfall days, 169.2mm (6.7") of precipitation is typically accumulated.

What is the sea water temperature in September in Singapore?

In Singapore, Singapore, in September, the average water temperature is 29.4°C (84.9°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Singapore have in September?

In September, the average length of the day in Singapore, Singapore, is 12.1h.

How long on average sun shines in September in Singapore?

In September, the average sunshine in Singapore is 5.2h.

When is the highest UV index in Singapore?

January through May, August through December, with an average UV index of 12, are months with the highest UV index in Singapore, Singapore.

What is the UV index reading in September in Singapore?

In September, the average UV index in Singapore, Singapore, is 12.
Average temperature in September - Singapore, Singapore
  • 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).

  • 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).

Average humidity in September - Singapore, Singapore
  • 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%).

Average rainfall in September - Singapore, Singapore
  • 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).

Average rainfall days in September - Singapore, Singapore
  • 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).

Average sea temperature in September - Singapore, Singapore
  • 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).

Average daylight in September / Average sunshine in September - Singapore, Singapore
  • Average daylight in September: 12.1h

Months with the longest days are May, June, July and August (Average daylight: 12.2h).
The month with shortest days is December (Average daylight: 12h).

  • 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).

Average UV index in September - Singapore, Singapore
  • 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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