Khon Kaen weather by month
Khon Kaen runs from about 24°C in December to 33°C in April, with May the wettest month at 278 mm.
warmest month
April
33°C
coolest month
December
24°C
wettest month
May
278 mm
worst air month
April
37 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 25°C | 10 mm | 316 h | 18 |
| February | 27°C | 7 mm | 310 h | 19 |
| March | 29°C | 68 mm | 326 h | 27 |
| April | 33°C | 3 mm | 351 h | 37 |
| May | 30°C | 278 mm | 299 h | 23 |
| June | 29°C | 199 mm | 291 h | 13 |
| July | 28°C | 277 mm | 234 h | 11 |
| August | 28°C | 117 mm | 302 h | 11 |
| September | 27°C | 217 mm | 250 h | 10 |
| October | 27°C | 98 mm | 333 h | 11 |
| November | 26°C | 13 mm | 317 h | 13 |
| December | 24°C | 1 mm | 307 h | 11 |
About 3,636 hours of sun a year. Roughly 130 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 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.