Union Island weather in January 2025

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

  • 29°C maximum daytime temperature in January in Union Island29
    29°C max day temperature
  • 8 hours of sunshine per day
  • 16 days with some rainfall in January in Union Island16
    16 days with some rainfall
  • 21°C minimum night-time temperature in January in Union Island21
    21°C min night temperature
  • 11 hours of daylight per day in January in Union Island11
    11 hours of daylight per day
  • High heat & humidity in January in Union IslandH
    High heat & humidity
  • 78 mm monthly rainfall in January in Union Island78
    78 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in January in Union Island10
    10 (Very High) UV index
  • 27°C sea temperature in January in Union Island27
    27°C sea temperature

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The January 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 January?

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

How sunny is it in Union Island in January?

There are normally 8 hours of bright sunshine each day in Union Island in January - that's 71% of daylight hours.

How warm is the sea around Union Island in January?

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

Does it rain in Union Island in January?

There are usually 16 days with some rain in Union Island in January and the average monthly rainfall is 78mm.

Union Island January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st January 2025 06:27 17:52
Thursday, 16th January 2025 06:31 18:00
Friday, 31st January 2025 06:32 18:07

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