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St Lucia weather live forecast
Today's maximum temperature in St Lucia is expected to be 88°F. Select a day from the live weather forecast for St Lucia (Castries) for more weather parameters.
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Friday
5th Sep
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Saturday
6th Sep
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Sunday
7th Sep -
Monday
8th Sep -
Tuesday
9th Sep
5-day weather forecast updated at 04:01 on Friday 5th September 2025 GMT
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The 5-day weather forecast for St Lucia (Castries) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.
Top St Lucia destinations
Below are temperatures expected today at popular countries, regions and places in St Lucia. Select a destination to see the detailed weather forecast for today, tomorrow and the outlook for the next five days.
All St Lucia destinations
- Anse la Raye
- Cap Estate
- Castries
- Choc Bay
- Grand Anse
- Gros Islet
- Marigot Bay
- Morgan Bay
- Reduit Beach
- Rodney Bay
- Soufriere
- Vieux Fort
St Lucia weather forecast by day
Below are the detailed weather forecasts for St Lucia for the next 5 days. The forecasts shown are for Castries and may not represent the whole of St Lucia. Browse more destinations in St Lucia to view more weather forecasts.
St Lucia weather for Friday 5th September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 55% chance of some rain and a gentle breeze of 11 mph from the east.
- °F maximum temperature
- °F minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Very High)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- mph wind from E
St Lucia weather for Saturday 6th September 2025
Expect broken clouds in St Lucia with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the east.
- °F maximum temperature
- °F minimum temperature
-
broken clouds
- hours of sunshine
- UV index (Very High)
- mm of rainfall expected
- moderate heat & humidity
- mph wind from E
St Lucia weather for Sunday 7th September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 71% chance of some rain and a gentle breeze of 9 mph from the east.
- °F maximum temperature
- °F minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Very High)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- mph wind from E
St Lucia weather for Monday 8th September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 90°F, moderate levels of heat & humidity, maximum UV of 11 (Extreme) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and a light breeze of 7 mph from the east.
- °F maximum temperature
- °F minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Extreme)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- mph wind from E
St Lucia weather for Tuesday 9th September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 90°F, high levels of heat & humidity, maximum UV of 11 (Extreme) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 69% chance of some rain and a light breeze of 7 mph from the east.
- °F maximum temperature
- °F minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Extreme)
- % chance of some rain
- mm of rainfall expected
- high heat & humidity
- mph wind from E
- Save up to £300 on all inclusive holidays to the Caribbean
- Discount varies by total spend. 7 night minimum stay
- Travel before 31st December 2027 (inclusive)
Show discount code
******ALE
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Expires at 23:59 on Tuesday 30th Sep 2025 · View all Sandals offers
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