Bandar Seri Begawan weather in September
September in Bandar Seri Begawan: sweltering, soaked, with very humid — a fair time to visit.
#9 of 12 months in Bandar Seri Begawan · #541 of 604 destinations to visit in September · comfort 56/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Bandar Seri Begawan climate normals — September
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 76°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 219 mm / 8.6 in | ⛈ soaked |
| Rainy days | 21 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 8.9 h/day | |
| Daylight | 12.1 h | |
| Wind | 9 km/h / 6 mph | |
| Air quality (US AQI) | 52 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Bandar Seri Begawan?
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Bandar Seri Begawan in September — FAQ
- Is September a good time to visit Bandar Seri Begawan?
- September in Bandar Seri Begawan: sweltering, soaked, with very humid — a fair time to visit. It ranks #9 of 12 months for Bandar Seri Begawan on SeasonMap's comfort score (56/100).
- What is the weather like in Bandar Seri Begawan in September?
- In September, Bandar Seri Begawan averages a daily high of 30.1°C and a low of 24.6°C, with about 218.8 mm of rain over roughly 20.8 rainy days.
- What is the air quality in Bandar Seri Begawan in September?
- Bandar Seri Begawan has a mean US Air Quality Index of about 52 in September.