Bandar Seri Begawan Weather in September

In Bandar Seri Begawan, September brings very high daytime temperatures around 32°C (90°F), with nights cooling to 25°C (77°F). This month falls within the rainy season, so expect frequent rainfall.

Rainfall in Bandar Seri Begawan in September

Bandar Seri Begawan is in the rainy season in September, with rain on around 21 days and an average of 213 mm (8.4 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.

Temperature in Bandar Seri Begawan in September

Temperatures in Bandar Seri Begawan in September top out at 32°C (90°F) and drop to 25°C (77°F) overnight. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.

Sunshine in Bandar Seri Begawan in September

Expect sunny days throughout the month, with an estimated 199 hours of sunshine. Despite being the rainy season, it could still be a nice time to visit. Rain often arrives later in the day, keeping most of the days sunny.

Wind Speed in Bandar Seri Begawan in September

Wind speeds average 1 m/s (2 knots) during September. At this speed, you'll experience mostly light air movement that's just barely noticeable. As an average, some days will be completely calm while others have gentle breezes you can feel on your skin.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. February and March typically offer the best weather for Bandar Seri Begawan.

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• January
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• March
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• May
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• October
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For a detailed overview over the year and the best time to visit Brunei Darussalam, check out our Bandar Seri Begawan's climate page.

Bandar Seri Begawan Temperature in September

Min Temperature 25°C (77°F)  

Max Temperature 32°C (90°F)  

Chance of Rain 69%  

Precipitation 213 mm (8.4 in)  

Rainy days 21 days  

Windspeed 1 m/s (2 knots) *  

Sunshine 199 hours *  

Percentage Sunshine *  

* Data from: Brunei Ap., Brunei Darussalam (4 KM, 3 Miles).

Daily Historical Temperatures

48-year average (1978-2025)

Based on our historical records, temperatures in Bandar Seri Begawan typically stay consistent throughout September, with daily highs averaging around 32°C (90°F). Nights are warm, with lows around 24°C (75°F).

Average temperatures in September

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Daily Historical Precipitation

48-year average (1978-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Historical weather for Bandar Seri Begawan in September

Browse day-by-day weather records for Bandar Seri Begawan spanning 50 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Bandar Seri Begawan historical weather extremes in September

According to our 38 years of weather records for Bandar Seri Begawan, the following extremes were recorded between 1987 and 2025.

• On September 3, 2019, temperatures climbed to 36°C (97°F), marking the warmest September day on record.
• Bandar Seri Begawan experienced its chilliest September day on September 15, 2021, reaching only 27°C (81°F).
• The coldest night in September in Bandar Seri Begawan was on September 4, 2021, with a minimum of 22°C (72°F).

What to Wear in Bandar Seri Begawan in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Bandar Seri Begawan in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Brunei Darussalam, check out our Bandar Seri Begawan's climate page.

More climate data for Bandar Seri Begawan

Temperature Rainfall Sunshine Wind Speed

See the full Bandar Seri Begawan climate overview or explore weather in Brunei Darussalam.