Saipan weather by month
Saipan runs from about 24°C in February to 27°C in June, with September the wettest month at 419 mm.
warmest month
June
27°C
coolest month
February
24°C
wettest month
September
419 mm
worst air month
April
7 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 25°C | 36 mm | 328 h | 6 |
| February | 24°C | 31 mm | 317 h | 6 |
| March | 25°C | 58 mm | 348 h | 5 |
| April | 26°C | 60 mm | 359 h | 7 |
| May | 26°C | 68 mm | 383 h | 7 |
| June | 27°C | 73 mm | 378 h | 4 |
| July | 26°C | 142 mm | 355 h | 5 |
| August | 26°C | 332 mm | 299 h | 3 |
| September | 25°C | 419 mm | 245 h | 3 |
| October | 25°C | 395 mm | 253 h | 4 |
| November | 26°C | 101 mm | 315 h | 5 |
| December | 26°C | 79 mm | 316 h | 6 |
About 3,896 hours of sun a year. Roughly 155 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.