Koh Lanta weather by month
Koh Lanta runs from about 27°C in November to 30°C in April, with September the wettest month at 496 mm.
warmest month
April
30°C
coolest month
November
27°C
wettest month
September
496 mm
worst air month
January
12 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 28°C | 26 mm | 338 h | 12 |
| February | 29°C | 11 mm | 322 h | 9 |
| March | 30°C | 38 mm | 339 h | 10 |
| April | 30°C | 84 mm | 336 h | 12 |
| May | 29°C | 245 mm | 321 h | 7 |
| June | 29°C | 247 mm | 277 h | 7 |
| July | 28°C | 222 mm | 239 h | 8 |
| August | 28°C | 373 mm | 276 h | 8 |
| September | 27°C | 496 mm | 260 h | 6 |
| October | 27°C | 242 mm | 281 h | 5 |
| November | 27°C | 200 mm | 246 h | 8 |
| December | 27°C | 121 mm | 273 h | 9 |
About 3,508 hours of sun a year. Roughly 204 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.