Union Island weather live forecast

Today's maximum temperature in Union Island is expected to be 79°F. Select a day from the live weather forecast for Union Island, St Vincent & the Grenadines for more weather parameters.

Tuesday
23rd Dec
79

79

7

8
Wednesday
24th Dec
79

79

6

9
Thursday
25th Dec
79

79

6

9
Friday
26th Dec
79

77

7

9
Saturday
27th Dec
79

77

7

9

5-day weather forecast updated at 04:01 on Tuesday 23rd December 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 Tuesday 23rd December 2025

Expect sunshine and showers in Union Island, St Vincent & the Grenadines with a maximum temperature of 79°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 37% chance of some rain and a moderate breeze of 15 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
sunshine and showers
7
hours of sunshine
8
UV index (Very High)
37
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
15
mph wind from E

Union Island weather for Wednesday 24th December 2025

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 79°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 14 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
broken clouds
6
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
14
mph wind from E

Union Island weather for Thursday 25th December 2025

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 79°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 24% chance of some rain and a gentle breeze of 11 mph from the north-east.

79
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
6
hours of sunshine
9
UV index (Very High)
24
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
11
mph wind from NE

Union Island weather for Friday 26th December 2025

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 79°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 14 mph from the north-east.