St Lucia weather in March
St Lucia averages 28°C by day and 24°C at night in March, with the sea at 27°C and 17 days with at least 1 mm of rain.
Day
28°C
Night
24°C
Sea
27°C
Rainy days
17
Flight from London
8½h
What March feels like
March is hot but wet in St Lucia: rainy season, so pack for showers.
The sea is warm at 27°C: comfortable for long swims.
It is rainy season, with rain on about 17 days.
Of the 48 sun destinations we track, St Lucia is the #20 warmest in March.
Want it warmer in March?
These are hotter than St Lucia this month for at most an hour and a half more flying:
St Lucia weather by month
March is highlighted. Compare with February and April, or see the full year in St Lucia.
St Lucia in March: quick answers
Is St Lucia hot in March?
March is hot but wet in St Lucia: rainy season, so pack for showers. Average highs are 28°C and lows 24°C.
Can you swim in St Lucia in March?
The sea is warm at 27°C: comfortable for long swims.
Does it rain in St Lucia in March?
It is rainy season, with rain on about 17 days.
What is the warmest month in St Lucia?
September, at an average high of 30°C. The coolest is January at 27°C.
How long is the flight to St Lucia from the UK?
About 8½h direct from London, estimated from the 6,769 km distance. Check your airline for exact times.
Still choosing? See where is hot in March for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in March from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. A rainy day has at least 1 mm of rain. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning St Lucia in March?
Save the restaurants, beaches and views you find on TikTok and Instagram for St Lucia straight to a map, then let Dream Trip turn them into a day-by-day plan.
