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St Lucia weather
Read our complete guide to the weather in St Lucia.
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in December
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Below are the temperatures expected today at popular destinations in St Lucia. Select a destination to compare today's forecast with average weather conditions.
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The weather guide for St Lucia (Castries) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.
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Metric (°C / mm) | Imperial (°F / inches)
St Lucia weather overview
St Lucia, one of the Windward Islands, is large and mountainous with volcanic peaks. It attracts more rain than is normal tor the Caribbean.
This falls mainly from May to January and is most intense during the July to November hurricane season when tropical storms can make life difficult even if they don't hit the island directly.
The west coast (where Castries is located) is more sheltered from the prevailing winds.
Temperatures on St Lucia are high throughout the year but rarely unbearable since sea breezes help dissipate the humidity, although nights can be sticky.
Tropical storm risk: St Lucia hurricane season
% of month affected by tropical storms
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The St Lucia tropical storm risk chart above shows the hurricane season. The chart was processed from data supplied by the US Meteorological Agency (NOAA). Find out more about our data sources.
What to pack for St Lucia weather
Light cotton clothing is appropriate, and be prepared for rain at any time of the year.
More about St Lucia
Which is the hottest month in St Lucia?
The hottest time of year in Castries, St Lucia is normally September. Expect maximum daytime temperatures to reach 30°C with very high heat and humidity.
Which month has the most rain in St Lucia?
In terms of rainfall, October is usually the wettest month in Castries, St Lucia with 269mm on average. There are normally 18 days in October with some rain.
When is it sunniest in St Lucia?
The sunniest time of year in Castries, St Lucia is normally January with bright sunshine on average for 72% of daylight hours; that's 8 hours of sunshine per day.
When is the sea warmest in St Lucia?
The sea is usually at its warmest in Castries, St Lucia in September when the water temperature reaches 29°C.
What is the flight time to St Lucia from the UK?
The flight time to St Lucia from the UK is typically 9 hours.
What is the time difference between St Lucia and the UK?
The time difference between St Lucia and the UK is GMT-4 hours.
What is the main language spoken in St Lucia?
The main language spoken in St Lucia is English.
Learn a language for St Lucia with Busuu*, Lingoda* and Rocket Languages*.
What is the currency in St Lucia?
The currency in St Lucia is the Eastern Caribbean Dollar (XCD).
Which plugs are used in St Lucia?
St Lucia uses electrical plug type G (230 Volts) - the same as the UK.
Which side of the road do they drive on in St Lucia?
They drive on the left side of the road in St Lucia.
Compare St Lucia weather with the USA
Below the St Lucia weather chart shows average maximum daytime temperature for St Lucia (Castries) and the USA (Washington).
Maximum daytime temperature (°C)
St Lucia (Castries)
USA (Washington)
Jan
Feb
Mar
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May
Jun
Jul
Aug
Sep
Oct
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Dec
Metric (°C / mm) | Imperial (°F / inches)
Compare more St Lucia weather >>
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