Castries weather in August
August in Castries: sweltering, rainy, with clean air — an excellent time to visit.
#9 of 12 months in Castries · #230 of 604 destinations to visit in August · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Castries climate normals — August
| Daytime high | 29°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Feels like (high) | 34°C / 93°F | |
| Rainfall | 105 mm / 4.1 in | 🌧 rainy |
| Rainy days | 22 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 23°C / 74°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.6 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Castries?
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Castries in August — FAQ
- Is August a good time to visit Castries?
- August in Castries: sweltering, rainy, with clean air — an excellent time to visit. It ranks #9 of 12 months for Castries on SeasonMap's comfort score (83/100).
- What is the weather like in Castries in August?
- In August, Castries averages a daily high of 29.4°C and a low of 25.6°C, with about 104.9 mm of rain over roughly 21.8 rainy days.
- What is the air quality in Castries in August?
- Castries has a mean US Air Quality Index of about 42 in August.