September weather forecast and climate
Bandar Seri Begawan, Brunei

A scenic reflective view of the majestic grandeur of the Sultan Omar Ali Saifuddin Mosque in Bandar Seri Begawan, Brunei
A scenic reflective view of the majestic grandeur of the Sultan Omar Ali Saifuddin Mosque in Bandar Seri Begawan, Brunei
The first month of the autumn, September, is also a hot month in Bandar Seri Begawan, Brunei, with average temperature varying between 25.8°C (78.4°F) and 30.8°C (87.4°F).

Temperature

In Bandar Seri Begawan, Brunei, the average high-temperature is practically the same as in August - a still tropical 30.8°C (87.4°F). The average low-temperature, is 25.8°C (78.4°F).

Heat index

In September, the average heat index is appraised at a torrid 38.6°C (101.5°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, clothing, differences in body mass, height, and shape). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

August and September, with an average relative humidity of 75%, are the least humid months in Bandar Seri Begawan.

Rainfall

In Bandar Seri Begawan, during 25.9 rainfall days, 113mm (4.45") of precipitation is typically accumulated. Throughout the year, there are 310.9 rainfall days, and 1693mm (66.65") of precipitation is accumulated.

Sea temperature

In Bandar Seri Begawan, the average seawater temperature is 29.5°C (85.1°F).
Note: 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.

Daylight

The average length of the day in Bandar Seri Begawan is 12.1h.

Sunshine

With an average of 9h of sunshine, September has the most sunshine of the year.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Bandar Seri Begawan, Brunei. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Bandar Seri Begawan?

In Bandar Seri Begawan, in September, the average high-temperature is 30.8°C (87.4°F), and the average low-temperature is 25.8°C (78.4°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that represents influence of the relative humidity to air temperaure, in September is calculated to 38.6°C (101.5°F).

What are the least humid months in Bandar Seri Begawan?

August and September, with an average relative humidity of 75%, are the least humid months in Bandar Seri Begawan, Brunei.

What is the average humidity in September in Bandar Seri Begawan?

The average relative humidity in September in Bandar Seri Begawan is 75%.

How much does it rain in Bandar Seri Begawan in September?

In September, the rain falls for 25.9 days. Throughout September, 113mm (4.45") of precipitation is accumulated.

How warm is the water in September in Bandar Seri Begawan?

In Bandar Seri Begawan, in September, the average water temperature is 29.5°C (85.1°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.

What is the average length of the day in September in Bandar Seri Begawan?

The average length of the day in September in Bandar Seri Begawan, Brunei, is 12.1h.

What month has the most sunshine in Bandar Seri Begawan?

With an average of 9h of sunshine, September has the most sunshine of the year in Bandar Seri Begawan.

How many hours of sunshine does Bandar Seri Begawan have in September?

In September, the average sunshine in Bandar Seri Begawan is 9h.

What is the month with the highest UV index in Bandar Seri Begawan?

Months with the highest UV index in Bandar Seri Begawan, Brunei, are January through December, with an average maximum UV index of 7.

What are the months with the lowest UV index in Bandar Seri Begawan?

January through December, with an average maximum UV index of 7, are months with the lowest UV index in Bandar Seri Begawan, Brunei.

What is the UV index intensity in September in Bandar Seri Begawan?

The average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Bandar Seri Begawan, Brunei
  • Average high temperature in September: 30.8°C

The warmest months (with the highest average high temperature) are May and June (31.3°C).
Months with the lowest average high temperature are January and February (29.2°C).

  • Average low temperature in September: 25.8°C

The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is February (25°C).

Average humidity in September - Bandar Seri Begawan, Brunei
  • Average humidity in September: 75%

Months with the highest relative humidity are January, February and March (81%).
Months with the lowest relative humidity are August and September (75%).

Average rainfall in September - Bandar Seri Begawan, Brunei
  • Average rainfall in September: 113mm

The wettest month (with the highest rainfall) is December (206mm).
The driest month (with the least rainfall) is February (73mm).

Average rainfall days in September - Bandar Seri Begawan, Brunei
  • Average rainfall days in September: 25.9 days

The month with the highest number of rainy days is December (28.7 days).
The month with the least rainy days is February (21.3 days).

Average sea temperature in September - Bandar Seri Begawan, Brunei
  • Average sea temperature in September: 29.5°C

The best months for swimming (with the highest average sea temperature) are June and July (30.3°C).
The coldest month (with the lowest average sea temperature) is February (26.9°C).

Average daylight in September / Average sunshine in September - Bandar Seri Begawan, Brunei
  • Average daylight in September: 12.1h

Months with the longest days are June and July (Average daylight: 12.4h).
The month with the shortest days is December (Average daylight: 11.8h).

  • Average sunshine in September: 9h

The month with the most sunshine is September (Average sunshine: 9h).
The month with the least sunshine is January (Average sunshine: 8.2h).

Average UV index in September - Bandar Seri Begawan, Brunei
  • Average UV index in September: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).