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St Lucia weather live forecast
Today's maximum temperature in St Lucia is expected to be 33°C. Select a day from the live weather forecast for St Lucia (Castries) for more weather parameters.
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Friday
19th Sep
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Saturday
20th Sep -
Sunday
21st Sep -
Monday
22nd Sep -
Tuesday
23rd Sep
5-day weather forecast updated at 04:00 on Friday 19th 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 19th September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 33°C, high levels of heat & humidity, maximum UV of 11 (Extreme) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 64% chance of some rain and a light breeze of 9 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Extreme)
- % chance of some rain
- mm of rainfall expected
- high heat & humidity
- kph wind from E
St Lucia weather for Saturday 20th September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 11 (Extreme) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 46% chance of some rain and a light breeze of 10 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Extreme)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- kph wind from E
St Lucia weather for Sunday 21st September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 11 (Extreme) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 72% chance of some rain and a gentle breeze of 17 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Extreme)
- % chance of some rain
- mm of rainfall expected
- high heat & humidity
- kph wind from E
St Lucia weather for Monday 22nd September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 11 (Extreme) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 63% chance of some rain and a gentle breeze of 17 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Extreme)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- kph wind from E
St Lucia weather for Tuesday 23rd September 2025
Expect isolated thunderstorms in St Lucia with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 11 (Extreme) and 6 hours of bright sunshine. There are 20-30 mm of rainfall expected with 87% chance of some rain and a gentle breeze of 15 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
isolated thunderstorms
- hours of sunshine
- UV index (Extreme)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- kph 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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Metric (°C / mm) | Imperial (°F / inches)
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