September weather forecast
Singapore, Singapore

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The colorful night skyline of Singapore city in Singapore
The colorful night skyline of Singapore city in Singapore

Weather in September

September marks the transition phase into the final quarter of the year in Singapore. The subtle dip in sea temperature to 29.4°C (84.9°F) slightly cools the bathing conditions but retains the inviting warmth familair to this region. Singapore's weather in September carries forward the climate characteristics of August, exhibiting limited change in rainfall, temperature or humidity. The continuous sequence of warm days and mild nights keep the dynamic spirit of the city alive. September offers a stable climate and continues to encourage outdoor activities for locals and tourists.

Temperature

The weather during September in Singapore hits a high-temperature average of a still hot 30.9°C (87.6°F), identical to the previous month. Singapore's temperature in September lowers to a consistent average of 24.2°C (75.6°F) during the nights.

Heat index

The heat index value during September is computed to be a blistering 42°C (107.6°F). Exercise extra preventive actions, heat cramps and heat exhaustion are plausible. Continuous activity could result in heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', measures the perceived warmth when incorporating the humidity present in the air. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In September, the average relative humidity is 83.4%.

Rainfall

In September, in Singapore, Singapore, the rain falls for 14 days. Throughout September, 169mm (6.65") of precipitation is accumulated. In Singapore, during the entire year, the rain falls for 178 days and collects up to 2343mm (92.24") of precipitation.

Sea temperature

In September, the average sea temperature in Singapore, Singapore, is 29.4°C (84.9°F).
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

In Singapore, the average length of the day in September is 12h and 7min.
On the first day of the month, sunrise is at 07:00 and sunset at 19:08. On the last day of September, sunrise is at 06:51 and sunset at 18:57 +08.

Sunshine

In September, the average sunshine is 5.2h.

UV index

The months with the highest UV index in Singapore are January through May, August through December, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum UV index of 12 in September translates into the following recommendations:
Implement all key precautions. Warding off sun damage is critical. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Broad-spectrum SPF 30+ sunscreen must be generously applied and reapplied every two hours or post any outdoor activity or swim. Beware! Reflecting off water and sand, UV rays are much stronger.

Frequently asked questions

Is it hot in Singapore during September?

In Singapore, 30.9°C (87.6°F) is the average high-temperature and 24.2°C (75.6°F) is the average low-temperature during September. In September, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is computed to be 42°C (107.6°F).

What is the average humidity in September in Singapore?

The average relative humidity in September in Singapore is 83.4%.

How many days does it rain in September in Singapore?

In Singapore, in September, during 14 rainfall days, 169mm (6.65") of precipitation is typically accumulated.

What is the sea water temperature in September in Singapore?

In Singapore, Singapore, the average seawater temperature in September is 29.4°C (84.9°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Singapore have in September?

The average day length in September in Singapore, Singapore, is 12h and 7min.

When are sunrise and sunset in September in Singapore?

In September, on the first day of the month, sunrise is at 07:00 and sunset at 19:08. On the last day of the month, in Singapore, sunrise is at 06:51 and sunset at 18:57 +08.

How long on average sun shines in September in Singapore?

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

What are the months with the highest UV index in Singapore?

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

What is the UV index intensity in September in Singapore?

The average daily maximum UV index in September is 12. A UV Index estimate of 11, and higher, represents an excessive health risk from exposure to the Sun's UV radiation.

Average temperature in September
Singapore, Singapore

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

The 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 - Singapore, Singapore
  • Average humidity in September: 83.4%

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

Average rainfall in September
Singapore, Singapore

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 least rainfall) is July (158.7mm).

Average rainfall days in September
Singapore, Singapore

Average rainfall days in September - Singapore, Singapore
  • Average rainfall days in September: 14 days

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

Average sea temperature in September
Singapore, Singapore

Average sea temperature in September - Singapore, Singapore
  • Average sea temperature in September: 29.4°C

The 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 / Average sunshine in September - Singapore, Singapore
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 12min).
The month with the shortest days is December (Average daylight: 12h and 0min).

  • Average sunshine in September: 5h and 1min

The month with the most sunshine is February (Average sunshine: 6h and 30min).
The months with the least sunshine are November and December (Average sunshine: 4h and 18min).

Average UV index in September
Singapore, Singapore

Average UV index in September - Singapore, Singapore
  • Average UV index in September: 12

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

Singapore, Singapore

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