St Lucia weather in May 2025

Expect 30°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in St Lucia in May. Check more long-term weather averages for St Lucia in May before you book your next holiday to St Lucia in 2025/2026.

  • 30°C maximum daytime temperature in May in St Lucia (Castries)30
    30°C max day temperature
  • 8 hours of sunshine per day
  • 15 days with some rainfall in May in St Lucia (Castries)15
    15 days with some rainfall
  • 24°C minimum night-time temperature in May in St Lucia (Castries)24
    24°C min night temperature
  • 13 hours of daylight per day in May in St Lucia (Castries)13
    13 hours of daylight per day
  • High heat & humidity in May in St Lucia (Castries)H
    High heat & humidity
  • 124 mm monthly rainfall in May in St Lucia (Castries)124
    124 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in St Lucia (Castries)11
    11+ (Extreme) UV index
  • 28°C sea temperature in May in St Lucia (Castries)28
    28°C sea temperature

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The May 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 May. Select a holiday destination to see more weather parameters.

All St Lucia destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about St Lucia

How hot is it in St Lucia in May?

Daytime temperatures usually reach 30°C in Castries, St Lucia in May with high heat and humidity, falling to 24°C at night.

How sunny is it in St Lucia in May?

There are normally 8 hours of bright sunshine each day in Castries, St Lucia in May - that's 64% of daylight hours.

How warm is the sea around St Lucia in May?

The average sea temperature around Castries, St Lucia in May is 28°C.

Does it rain in St Lucia in May?

There are usually 15 days with some rain in Castries, St Lucia in May and the average monthly rainfall is 124mm.

St Lucia May sunrise & sunset times

Browse the sunrise and sunset times for St Lucia in May 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
Thursday, 1st May 2025 05:42 18:20
Friday, 16th May 2025 05:37 18:24
Saturday, 31st May 2025 05:35 18:29

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