Koh Chang weather by month
Koh Chang runs from about 23°C in July to 27°C in April, with July the wettest month at 1025 mm.
warmest month
April
27°C
coolest month
July
23°C
wettest month
July
1025 mm
worst air month
February
17 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 25°C | 35 mm | 336 h | 14 |
| February | 25°C | 36 mm | 318 h | 17 |
| March | 25°C | 66 mm | 341 h | 14 |
| April | 27°C | 20 mm | 358 h | 13 |
| May | 26°C | 264 mm | 288 h | 8 |
| June | 24°C | 630 mm | 238 h | 7 |
| July | 23°C | 1025 mm | 169 h | 8 |
| August | 24°C | 285 mm | 300 h | 7 |
| September | 24°C | 574 mm | 225 h | 5 |
| October | 24°C | 315 mm | 268 h | 6 |
| November | 25°C | 56 mm | 323 h | 8 |
| December | 24°C | 7 mm | 317 h | 8 |
About 3,481 hours of sun a year. Roughly 199 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.