December · Saint Lucia
Best time to visit Castries in December Weather, crowds & prices
Weather in Castries in December
Average temperature 28°C, 31 mm of rain, about 19 days with 6+ hours of sunshine and 75% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
9.3/10
Ranked #6 of 12 months
- Avg temp
- 28°C
- Rainfall
- 31 mm
- Humidity
- 75%
- Days with 6h+ sun
- 19
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
December in Castries scores 9.3/10 for beach and coastal travel - an above-average month (#6 of 12). Expect around 28°C, 31 mm of rain, and roughly 19 days with 6+ hours of sunshine this month.
Castries is Saint Lucia's capital, a harbour town beneath green hills on the island's northwest coast.
December in Castries — one of the year's strongest windows (6th)
December averages 28°C (82°F) and humidity near 75%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 31 mm of rain — occasional showers rather than washed-out days — alongside about 19 days with 6+ hours of sunshine and 11.2 daylight hours.
A 9.3/10 puts this among the year's best months in Castries (6th of 12); only March scores higher, at 9.8/10.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
Plan for peak pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Castries in December?
- In December, Castries averages 28°C, 31 mm of rain, and about 19 days with 6+ hours of sunshine. Its climate-comfort score is 9.3/10.
- Is December a good time to visit Castries?
- December earns a 9.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Castries in December?
- Expect about 31 mm of rain in December. Average humidity is 75% and there are about 19 days with 6+ hours of sunshine.
Curated in Castries
Tickets & experiences
Things to do in Castries
Castries, Saint Lucia. Live activities and tours from GetYourGuide, matched to this destination.