Basseterre weather by month
Basseterre runs from about 26°C in February to 29°C in October, with February the wettest month at 150 mm.
warmest month
October
29°C
coolest month
February
26°C
wettest month
February
150 mm
worst air month
June
12 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 26°C | 36 mm | 335 h | 5 |
| February | 26°C | 150 mm | 296 h | 7 |
| March | 26°C | 40 mm | 355 h | 6 |
| April | 27°C | 71 mm | 358 h | 5 |
| May | 28°C | 91 mm | 349 h | 8 |
| June | 29°C | 67 mm | 353 h | 12 |
| July | 28°C | 107 mm | 357 h | 10 |
| August | 28°C | 137 mm | 350 h | 8 |
| September | 28°C | 97 mm | 326 h | 6 |
| October | 29°C | 47 mm | 344 h | 6 |
| November | 27°C | 130 mm | 280 h | 5 |
| December | 27°C | 37 mm | 320 h | 5 |
About 4,023 hours of sun a year. Roughly 103 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.