Basseterre weather in September
September in Basseterre: hot, rainy, with clean air — an excellent time to visit.
#10 of 12 months in Basseterre · #463 of 897 destinations to visit in September · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Basseterre in September
No notes yet. Open Basseterre on the map to add the first one.
Basseterre climate normals — September
| Daytime high | 29°C / 84°F | 🥵 hot |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Rainfall | 109 mm / 4.3 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 12.2 h | |
| Wind | 26 km/h / 16 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Basseterre?
Loading map…
Basseterre in September — FAQ
- Is September a good time to visit Basseterre?
- September in Basseterre: hot, rainy, with clean air — an excellent time to visit. It ranks #10 of 12 months for Basseterre on SeasonMap's comfort score (82/100).
- What is the weather like in Basseterre in September?
- In September, Basseterre averages a daily high of 29°C and a low of 26.7°C, with about 108.7 mm of rain over roughly 17.8 rainy days.
- What is the air quality in Basseterre in September?
- Basseterre has a mean US Air Quality Index of about 32 in September.