St Lucia weather in May
St Lucia averages 29°C by day and 25°C at night in May, with the sea at 28°C and about 61 mm of rain in the month.
Day
29°C
Night
25°C
Sea
28°C
Rain
61 mm
Flight from London
8½h
What May feels like
May is hot in St Lucia: proper beach weather.
The sea is warm at 28°C: comfortable for long swims.
Rain is occasional: about 61 mm in the month.
That is 11°C warmer than an average May day in London.
Of the 56 sun destinations we track, St Lucia is the #22 warmest in May.
Going to St Lucia in May?
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 May?
These are hotter than St Lucia this month for at most an hour and a half more flying:
St Lucia weather by month
May is highlighted. Compare with April and June, 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 May: quick answers
Is St Lucia hot in May?
May is hot in St Lucia: proper beach weather. Average highs are 29°C and lows 25°C.
Can you swim in St Lucia in May?
The sea is warm at 28°C: comfortable for long swims.
Does it rain in St Lucia in May?
Rain is occasional: about 61 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 May for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in May 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 May?
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.
