Apia weather by month
Apia runs from about 25°C in August to 28°C in March, with February the wettest month at 440 mm.
warmest month
March
28°C
coolest month
August
25°C
wettest month
February
440 mm
worst air month
June
7 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 27°C | 343 mm | 340 h | 4 |
| February | 27°C | 440 mm | 240 h | 5 |
| March | 28°C | 180 mm | 346 h | 4 |
| April | 28°C | 169 mm | 302 h | 3 |
| May | 27°C | 332 mm | 304 h | 4 |
| June | 26°C | 144 mm | 309 h | 7 |
| July | 26°C | 199 mm | 295 h | 5 |
| August | 25°C | 75 mm | 309 h | 6 |
| September | 26°C | 156 mm | 319 h | 5 |
| October | 26°C | 280 mm | 328 h | 5 |
| November | 26°C | 326 mm | 287 h | 4 |
| December | 26°C | 281 mm | 332 h | 3 |
About 3,711 hours of sun a year. Roughly 269 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.