St. George's weather in September
September in St. George's: sweltering, rainy, with clean air — an excellent time to visit.
#7 of 12 months in St. George's · #315 of 604 destinations to visit in September · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
St. George's climate normals — September
| Daytime high | 29°C / 84°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 27°C / 81°F | |
| Feels like (high) | 34°C / 93°F | |
| Rainfall | 119 mm / 4.7 in | 🌧 rainy |
| Rainy days | 17 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 12.2 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. George's in September — FAQ
- Is September a good time to visit St. George's?
- September in St. George's: sweltering, rainy, with clean air — an excellent time to visit. It ranks #7 of 12 months for St. George's on SeasonMap's comfort score (80/100).
- What is the weather like in St. George's in September?
- In September, St. George's averages a daily high of 29°C and a low of 27°C, with about 118.7 mm of rain over roughly 17 rainy days.
- What is the air quality in St. George's in September?
- St. George's has a mean US Air Quality Index of about 39 in September.