Bandar Seri Begawan weather by month
Bandar Seri Begawan runs from about 26°C in August to 28°C in April, with May the wettest month at 684 mm.
warmest month
April
28°C
coolest month
August
26°C
wettest month
May
684 mm
worst air month
July
16 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 27°C | 303 mm | 292 h | 9 |
| February | 27°C | 182 mm | 283 h | 12 |
| March | 27°C | 235 mm | 312 h | 14 |
| April | 28°C | 385 mm | 286 h | 13 |
| May | 27°C | 684 mm | 253 h | 9 |
| June | 27°C | 338 mm | 266 h | 9 |
| July | 27°C | 256 mm | 264 h | 16 |
| August | 26°C | 397 mm | 263 h | 12 |
| September | 27°C | 136 mm | 263 h | 12 |
| October | 27°C | 206 mm | 281 h | 12 |
| November | 27°C | 362 mm | 299 h | 15 |
| December | 27°C | 347 mm | 249 h | 7 |
About 3,311 hours of sun a year. Roughly 313 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.