Union Island weather live forecast

Today's maximum temperature in Union Island is expected to be 27°C. Select a day from the live weather forecast for Union Island, St Vincent & the Grenadines for more weather parameters.

• Sunday
  30th Nov
  27
  27
  
  5
  8
• Monday
  1st Dec
  27
  27
  
  7
  9
• Tuesday
  2nd Dec
  27
  27
  
  7
  9
• Wednesday
  3rd Dec
  27
  26
  
  6
  8
• Thursday
  4th Dec
  27
  26
  
  3
  9

5-day weather forecast updated at 04:01 on Sunday 30th November 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 Sunday 30th November 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 53% chance of some rain and a moderate breeze of 27 kph from the east.

• 27
  °C maximum temperature
• 27
  °C minimum temperature
• 
  isolated thunderstorms
• 5
  hours of sunshine
• 8
  UV index (Very High)
• 53
  % chance of some rain
• <10
  mm of rainfall expected
• L
  low heat & humidity
• 27
  kph wind from E

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Union Island weather for Monday 1st December 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 18% chance of some rain and a moderate breeze of 25 kph from the north-east.

• 27
  °C maximum temperature
• 27
  °C minimum temperature
• 
  isolated thunderstorms
• 7
  hours of sunshine
• 9
  UV index (Very High)
• 18
  % chance of some rain
• <2
  mm of rainfall expected
• L
  low heat & humidity
• 25
  kph wind from NE

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Union Island weather for Tuesday 2nd December 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 72% chance of some rain and a moderate breeze of 20 kph from the north-east.

• 27
  °C maximum temperature
• 27
  °C minimum temperature
• 
  isolated thunderstorms
• 7
  hours of sunshine
• 9
  UV index (Very High)
• 72
  % chance of some rain
• <2
  mm of rainfall expected
• L
  low heat & humidity
• 20
  kph wind from NE

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Union Island weather for Wednesday 3rd December 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 10-20 mm of rainfall expected with 97% chance of some rain and a gentle breeze of 17 kph from the east.

• 27
  °C maximum temperature
• 26
  °C minimum temperature
• 
  isolated thunderstorms
• 6
  hours of sunshine
• 8
  UV index (Very High)
• 97
  % chance of some rain
• <20
  mm of rainfall expected
• L
  low heat & humidity
• 17
  kph wind from E

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Union Island weather for Thursday 4th December 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 78% chance of some rain and a gentle breeze of 19 kph from the east.

• 27
  °C maximum temperature
• 26
  °C minimum temperature
• 
  isolated thunderstorms
• 3
  hours of sunshine
• 9
  UV index (Very High)
• 78
  % chance of some rain
• <20
  mm of rainfall expected
• L
  low heat & humidity
• 19
  kph wind from E

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Fred Olsen sale: £200pp off 2025/2026 cruises

Sale

• Save up to £200 per person on cruises in 2025/2026
• Book online in the Fred Olsen Black Friday sale
• Travel before 31st December 2026 (inclusive)

Go to Fred Olsen deal >>

Expires at 23:59 on Monday 1st Dec 2025 · View all Fred Olsen offers

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

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