Bangkok weather by month
Bangkok runs from about 28°C in October to 32°C in April, with July the wettest month at 332 mm.
warmest month
April
32°C
coolest month
October
28°C
wettest month
July
332 mm
worst air month
January
35 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 28°C | 14 mm | 332 h | 35 |
| February | 29°C | 20 mm | 315 h | 31 |
| March | 30°C | 66 mm | 333 h | 25 |
| April | 32°C | 5 mm | 354 h | 21 |
| May | 30°C | 270 mm | 302 h | 15 |
| June | 29°C | 179 mm | 284 h | 10 |
| July | 28°C | 332 mm | 187 h | 9 |
| August | 29°C | 163 mm | 296 h | 11 |
| September | 28°C | 294 mm | 245 h | 11 |
| October | 28°C | 219 mm | 310 h | 25 |
| November | 28°C | 66 mm | 316 h | 27 |
| December | 28°C | 10 mm | 314 h | 31 |
About 3,588 hours of sun a year. Roughly 161 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 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.