Union Island weather live forecast

Tomorrow's maximum temperature in Union Island is expected to be 82°F.

5-day weather forecast updated at 04:01 on Saturday 7th June 2025 GMT

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The 5-day weather forecast for St Vincent & the Grenadines (Union Island) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Union Island weather forecast by day

Below are the detailed weather forecasts for Union Island for the next 5 days.

Union Island weather for Saturday 7th June 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 36% chance of some rain and a moderate breeze of 17 mph from the east.

  • 82°F maximum temperature82
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 36% chance of some rain36
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Moderate breeze of 17 mph from the East17
    mph wind from E

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Union Island weather for Sunday 8th June 2025

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 10 (Very High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 19 mph from the east.

  • 81°F maximum temperature81
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 10 (Very High)10
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Fresh breeze of 19 mph from the East19
    mph wind from E

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Union Island weather for Monday 9th June 2025

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 11 (Extreme) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 18 mph from the east.

  • 81°F maximum temperature81
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 11 (Extreme)11
    UV index (Extreme)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Fresh breeze of 18 mph from the East18
    mph wind from E

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Union Island weather for Tuesday 10th June 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 11 (Extreme) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 56% chance of some rain and a fresh breeze of 20 mph from the east.

  • 81°F maximum temperature81
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 11 (Extreme)11
    UV index (Extreme)
  • 56% chance of some rain56
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Fresh breeze of 20 mph from the East20
    mph wind from E

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Union Island weather for Wednesday 11th June 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 11 (Extreme) and 7 hours of bright sunshine. There are 5-10 mm of rainfall expected with 67% chance of some rain and a fresh breeze of 20 mph from the east.

  • 81°F maximum temperature81
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 11 (Extreme)11
    UV index (Extreme)
  • 67% chance of some rain67
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Fresh breeze of 20 mph from the East20
    mph wind from E

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Sandals sale: up to 50% off + extra 5% off

  • Save up to 50% on all inclusive Caribbean holidays
  • Plus save up to £800 off select rooms & durations
  • Extra 5% discount on selected resorts
Go to Sandals deal >>

Expires at 23:59 on Monday 30th Jun 2025 · View all Sandals offers

SandalsHoliday resort finder

Metric (°C)  |  Imperial (°F)

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