Galle weather by month
Galle runs from about 26°C in November to 28°C in April, with May the wettest month at 625 mm.
warmest month
April
28°C
coolest month
November
26°C
wettest month
May
625 mm
worst air month
January
31 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 26°C | 229 mm | 294 h | 31 |
| February | 27°C | 80 mm | 333 h | 25 |
| March | 27°C | 110 mm | 348 h | 22 |
| April | 28°C | 223 mm | 316 h | 14 |
| May | 27°C | 625 mm | 254 h | 10 |
| June | 27°C | 336 mm | 309 h | 9 |
| July | 27°C | 246 mm | 313 h | 11 |
| August | 27°C | 371 mm | 289 h | 10 |
| September | 27°C | 327 mm | 302 h | 9 |
| October | 26°C | 296 mm | 262 h | 13 |
| November | 26°C | 389 mm | 251 h | 15 |
| December | 26°C | 172 mm | 311 h | 23 |
About 3,582 hours of sun a year. Roughly 286 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.