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 about 55 mm of rain in the month.
Day
28°C
Night
24°C
Sea
27°C
Rain
55 mm
Flight from London
8½h
What March feels like
March is hot in St Lucia: proper beach weather.
The sea is warm at 27°C: comfortable for long swims.
Rain is occasional: about 55 mm in the month.
That is 17°C warmer than an average March day in London.
Of the 56 sun destinations we track, St Lucia is the #24 warmest in March.
Comparing places? See which Caribbean island is warmest in winter for every winter month, place by place.
Going to St Lucia in March?
Share the TikToks and Instagram Reels you've saved for St Lucia to Dream Trip. It finds the places, pins them on a map and builds your days around them.
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.
| Month | Day | Night | Sea | Rain |
|---|---|---|---|---|
| January | 27°C | 24°C | 28°C | 70 mm |
| February | 27°C | 24°C | 27°C | 54 mm |
| March | 28°C | 24°C | 27°C | 55 mm |
| April | 29°C | 25°C | 28°C | 45 mm |
| May | 29°C | 25°C | 28°C | 61 mm |
| June | 29°C | 25°C | 29°C | 107 mm |
| July | 29°C | 25°C | 29°C | 129 mm |
| August | 30°C | 26°C | 30°C | 118 mm |
| September | 30°C | 26°C | 30°C | 109 mm |
| October | 29°C | 26°C | 30°C | 108 mm |
| November | 29°C | 25°C | 29°C | 113 mm |
| December | 28°C | 24°C | 28°C | 71 mm |
St Lucia in March: quick answers
Is St Lucia hot in March?
March is hot in St Lucia: proper beach weather. 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?
Rain is occasional: about 55 mm in the month.
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. Rain is the average monthly total. 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.
