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St Lucia weather in August 2025
Expect daytime maximum temperatures of 30°C in St Lucia in August and very high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 20 days with some rainfall and typically 216 mm of rainfall in the month.
- 30°C max day temperature
30 - 8 hours of sunshine per day
- 20 days with some rainfall
20 - 24°C min night temperature
24 - 13 hours of daylight per day
13 - Very High heat & humidity
VH - 216 mm of monthly rainfall
216 - 11+ (Extreme) UV index
11 - 29°C sea temperature
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Recommended for St Lucia
The August weather guide for St Lucia (Castries) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Top St Lucia destinations
Below are average maximum temperatures at popular countries, regions and places in St Lucia in August. Select a holiday destination to see more weather parameters.
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
Metric (°C / mm) | Imperial (°F / inches)
More about St Lucia
How hot is it in St Lucia in August?
Daytime temperatures usually reach 30°C in Castries, St Lucia in August with very high heat and humidity, falling to 24°C at night.
How sunny is it in St Lucia in August?
There are normally 8 hours of bright sunshine each day in Castries, St Lucia in August - that's 65% of daylight hours.
How warm is the sea around St Lucia in August?
The average sea temperature around Castries, St Lucia in August is 29°C.
Does it rain in St Lucia in August?
There are usually 20 days with some rain in Castries, St Lucia in August and the average monthly rainfall is 216mm.
What is the chance of a hurricane in St Lucia in August?
On average less than 1 day in August in Castries, St Lucia is likely to be affected by the passage of one or more tropical storms.
St Lucia August sunrise & sunset times
Browse the sunrise and sunset times for St Lucia in August 2025. Select a month to view St Lucia sunrise and sunset times for the next 12 months. The St Lucia sunrise and sunset times shown below are for Castries.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Friday, 1st August 2025 | 05:48 | 18:32 |
| Saturday, 16th August 2025 | 05:51 | 18:25 |
| Sunday, 31st August 2025 | 05:52 | 18:16 |
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