Union Island weather live forecast

Today's maximum temperature in Union Island is expected to be 81°F. Select a day from the live weather forecast for Union Island, St Vincent & the Grenadines for more weather parameters.

Monday
8th Dec
81

81

5

8
Tuesday
9th Dec
81

81

8

8
Wednesday
10th Dec
81

79

6

9
Thursday
11th Dec
81

79

7

9
Friday
12th Dec
81

79

7

9

5-day weather forecast updated at 04:02 on Monday 8th 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 Monday 8th December 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 8 (Very High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 19 mph from the east.

81
°F maximum temperature
81
°F minimum temperature
broken clouds
5
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
19
mph wind from E

Union Island weather for Tuesday 9th December 2025

Expect sunshine and showers in Union Island, St Vincent & the Grenadines with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 2-5 mm of rainfall expected with 11% chance of some rain and a fresh breeze of 19 mph from the east.

81
°F maximum temperature
81
°F minimum temperature
sunshine and showers
8
hours of sunshine
8
UV index (Very High)
11
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
19
mph wind from E

Union Island weather for Wednesday 10th December 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 9 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 18 mph from the east.

81
°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
18
mph wind from E

Union Island weather for Thursday 11th December 2025

Expect scattered clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 81°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 fresh breeze of 18 mph from the east.

81
°F maximum temperature
79
°F minimum temperature
scattered clouds
7
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
18
mph wind from E

Union Island weather for Friday 12th December 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 9 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 49% chance of some rain and a moderate breeze of 17 mph from the east.