St Lucia weather in August 2025

Expect 86°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in St Lucia in August. Check more long-term weather averages for St Lucia in August before you book your next holiday to St Lucia in 2025/2026.

  • 86°F maximum daytime temperature in August in St Lucia (Castries)86
    86°F max day temperature
  • 8 hours of sunshine per day
  • 20 days with some rainfall in August in St Lucia (Castries)20
    20 days with some rainfall
  • 75°F minimum night-time temperature in August in St Lucia (Castries)75
    75°F min night temperature
  • 13 hours of daylight per day in August in St Lucia (Castries)13
    13 hours of daylight per day
  • Very high heat & humidity in August in St Lucia (Castries)VH
    Very High heat & humidity
  • 8.5 inches monthly rainfall in August in St Lucia (Castries)8.5
    8.5 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in St Lucia (Castries)11
    11+ (Extreme) UV index
  • 84°F sea temperature in August in St Lucia (Castries)84
    84°F sea temperature

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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

Metric (°C)  |  Imperial (°F)

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More about St Lucia

How hot is it in St Lucia in August?

Daytime temperatures usually reach 86°F in Castries, St Lucia in August with very high heat and humidity, falling to 75°F 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 84°F.

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 8.5 inches.

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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