Koh Phangan weather by month
Koh Phangan runs from about 27°C in December to 31°C in April, with December the wettest month at 331 mm.
warmest month
April
31°C
coolest month
December
27°C
wettest month
December
331 mm
worst air month
January
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 28°C | 53 mm | 339 h | 14 |
| February | 28°C | 31 mm | 319 h | 12 |
| March | 29°C | 12 mm | 344 h | 12 |
| April | 31°C | 9 mm | 354 h | 12 |
| May | 30°C | 97 mm | 325 h | 6 |
| June | 29°C | 88 mm | 261 h | 5 |
| July | 28°C | 214 mm | 230 h | 7 |
| August | 28°C | 180 mm | 300 h | 6 |
| September | 28°C | 159 mm | 268 h | 5 |
| October | 27°C | 267 mm | 302 h | 5 |
| November | 27°C | 286 mm | 256 h | 9 |
| December | 27°C | 331 mm | 262 h | 11 |
About 3,560 hours of sun a year. Roughly 170 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.