Union Island weather in May 2025

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

  • 30°C maximum daytime temperature in May in Union Island30
    30°C max day temperature
  • 8 hours of sunshine per day
  • 14 days with some rainfall in May in Union Island14
    14 days with some rainfall
  • 23°C minimum night-time temperature in May in Union Island23
    23°C min night temperature
  • 13 hours of daylight per day in May in Union Island13
    13 hours of daylight per day
  • High heat & humidity in May in Union IslandH
    High heat & humidity
  • 76 mm monthly rainfall in May in Union Island76
    76 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in Union Island11
    11+ (Extreme) UV index
  • 27°C sea temperature in May in Union Island27
    27°C sea temperature

More about Union Island

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The May weather guide for St Vincent & the Grenadines (Union Island) 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.

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

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More about St Vincent & the Grenadines

How hot is it in Union Island in May?

Daytime temperatures usually reach 30°C in Union Island in May with high heat and humidity, falling to 23°C at night.

How sunny is it in Union Island in May?

There are normally 8 hours of bright sunshine each day in Union Island in May - that's 63% of daylight hours.

How warm is the sea around Union Island in May?

The average sea temperature around Union Island in May is 27°C.

Does it rain in Union Island in May?

There are usually 14 days with some rain in Union Island in May and the average monthly rainfall is 76mm.

Union Island May sunrise & sunset times

Browse the sunrise and sunset times for Union Island in May 2025. Select a month to view Union Island sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:45 18:20
Friday, 16th May 2025 05:41 18:24
Saturday, 31st May 2025 05:39 18:28

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