March · Saint Lucia
Best time to visit Castries in March Weather, crowds & prices
Weather in Castries in March
Average temperature 27°C, 12 mm of rain, about 31 days with 6+ hours of sunshine and 74% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
March score
9.8/10
Ranked #1 of 12 months
- Avg temp
- 27°C
- Rainfall
- 12 mm
- Humidity
- 74%
- Days with 6h+ sun
- 31
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
March in Castries scores 9.8/10 for beach and coastal travel - the single best month of the year. Expect around 27°C, 12 mm of rain, and roughly 31 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.
March: the best month of the year in Castries
March averages 27°C (80°F) and humidity near 74%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rain is a non-issue at 12 mm for the month, with about 31 days with 6+ hours of sunshine and 11.9 hours of daylight to work with.
On our climate-comfort scale this is the top-ranked month of the year for Castries at 9.8/10 — the reference point every other month on this page is measured against.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
Figure on peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Castries in March?
- In March, Castries averages 27°C, 12 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 9.8/10.
- Is March a good time to visit Castries?
- March earns a 9.8/10 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 March?
- Expect about 12 mm of rain in March. Average humidity is 74% and there are about 31 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.