St Lucia weather in January
St Lucia averages 27°C by day and 24°C at night in January, with the sea at 28°C and 20 days with at least 1 mm of rain.
Day
27°C
Night
24°C
Sea
28°C
Rainy days
20
Flight from London
8½h
What January feels like
January is hot but wet in St Lucia: rainy season, so pack for showers.
The sea is warm at 28°C: comfortable for long swims.
It is rainy season, with rain on about 20 days.
Of the 48 sun destinations we track, St Lucia is the #17 warmest in January.
Want it warmer in January?
These are hotter than St Lucia this month for at most an hour and a half more flying:
St Lucia weather by month
January is highlighted. Compare with December and February, or see the full year in St Lucia.
St Lucia in January: quick answers
Is St Lucia hot in January?
January is hot but wet in St Lucia: rainy season, so pack for showers. Average highs are 27°C and lows 24°C.
Can you swim in St Lucia in January?
The sea is warm at 28°C: comfortable for long swims.
Does it rain in St Lucia in January?
It is rainy season, with rain on about 20 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 January for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in January 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 January?
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.
