May · Saint Lucia
Best time to visit Castries in May Weather, crowds & prices
Weather in Castries in May
Average temperature 28°C, 33 mm of rain, about 30 days with 6+ hours of sunshine and 77% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
9.7/10
Ranked #4 of 12 months
- Avg temp
- 28°C
- Rainfall
- 33 mm
- Humidity
- 77%
- Days with 6h+ sun
- 30
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Castries scores 9.7/10 for beach and coastal travel - an above-average month (#4 of 12). Expect around 28°C, 33 mm of rain, and roughly 30 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.
May ranks 4th of 12 for Castries — one of the best windows
May averages 28°C (83°F) and humidity near 77%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 33 mm of rain — occasional showers rather than washed-out days — alongside about 30 days with 6+ hours of sunshine and 12.6 daylight hours.
A 9.7/10 puts this among the year's best months in Castries (4th 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 mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Castries in May?
- In May, Castries averages 28°C, 33 mm of rain, and about 30 days with 6+ hours of sunshine. Its climate-comfort score is 9.7/10.
- Is May a good time to visit Castries?
- May earns a 9.7/10 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 May?
- Expect about 33 mm of rain in May. Average humidity is 77% and there are about 30 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.