Castries weather in December
December in Castries: hot, a little rain, with clean air — an excellent time to visit.
#6 of 12 months in Castries · #48 of 604 destinations to visit in December · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Castries climate normals — December
| Daytime high | 28°C / 82°F | 🥵 hot |
|---|---|---|
| Nighttime low | 24°C / 76°F | |
| Feels like (high) | 30°C / 86°F | |
| Rainfall | 37 mm / 1.5 in | 🌦 some rain |
| Rainy days | 13 days | |
| Humidity | 75% | 💧 humid |
| Dew point | 21°C / 69°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 11.3 h | |
| Wind | 23 km/h / 14 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Castries?
Loading map…
Castries in December — FAQ
- Is December a good time to visit Castries?
- December in Castries: hot, a little rain, with clean air — an excellent time to visit. It ranks #6 of 12 months for Castries on SeasonMap's comfort score (87/100).
- What is the weather like in Castries in December?
- In December, Castries averages a daily high of 28°C and a low of 24.4°C, with about 37.2 mm of rain over roughly 13.2 rainy days.
- What is the air quality in Castries in December?
- Castries has a mean US Air Quality Index of about 39 in December.