Union Island weather in March 2025

Expect 29°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Union Island in March. Check more long-term weather averages for Union Island in March before you book your next holiday to St Vincent & the Grenadines in 2025/2026.

  • 29°C maximum daytime temperature in March in Union Island29
    29°C max day temperature
  • 8 hours of sunshine per day
  • 12 days with some rainfall in March in Union Island12
    12 days with some rainfall
  • 21°C minimum night-time temperature in March in Union Island21
    21°C min night temperature
  • 12 hours of daylight per day in March in Union Island12
    12 hours of daylight per day
  • High heat & humidity in March in Union IslandH
    High heat & humidity
  • 59 mm monthly rainfall in March in Union Island59
    59 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in March in Union Island11
    11+ (Extreme) UV index
  • 27°C sea temperature in March in Union Island27
    27°C sea temperature

More about Union Island

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The March 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 March?

Daytime temperatures usually reach 29°C in Union Island in March with high heat and humidity, falling to 21°C at night.

How sunny is it in Union Island in March?

There are normally 8 hours of bright sunshine each day in Union Island in March - that's 68% of daylight hours.

How warm is the sea around Union Island in March?

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

Does it rain in Union Island in March?

There are usually 12 days with some rain in Union Island in March and the average monthly rainfall is 59mm.

Union Island March sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st March 2025 06:21 18:15
Sunday, 16th March 2025 06:12 18:16
Monday, 31st March 2025 06:03 18:17

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