August · Saint Lucia
Best time to visit Castries in August Weather, crowds & prices
Weather in Castries in August
Average temperature 29°C, 74 mm of rain, about 29 days with 6+ hours of sunshine and 79% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
8.9/10
Ranked #9 of 12 months
- Avg temp
- 29°C
- Rainfall
- 74 mm
- Humidity
- 79%
- Days with 6h+ sun
- 29
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
August in Castries scores 8.9/10 for beach and coastal travel - ranked #9 of 12. Expect around 29°C, 74 mm of rain, and roughly 29 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.
August in Castries — one of the year's strongest windows (9th)
August averages 29°C (85°F) and humidity near 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 74 mm, so plan one flexible day in three; you still get about 29 days with 6+ hours of sunshine and 12.5 hours of daylight.
A 8.9/10 puts this among the year's best months in Castries (9th 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, a packable rain layer.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Castries in August?
- In August, Castries averages 29°C, 74 mm of rain, and about 29 days with 6+ hours of sunshine. Its climate-comfort score is 8.9/10.
- Is August a good time to visit Castries?
- August earns a 8.9/10 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 August?
- Expect about 74 mm of rain in August. Average humidity is 79% and there are about 29 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.