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.

Thursday
22nd Jan
79

79

6

8
Friday
23rd Jan
79

79

5

9
Saturday
24th Jan
79

79

6

9
Sunday
25th Jan
79

79

7

9
Monday
26th Jan
79

79

6

10

5-day weather forecast updated at 04:01 on Thursday 22nd January 2026 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 Thursday 22nd January 2026

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 8 (Very High) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 47% chance of some rain and a moderate breeze of 14 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
6
hours of sunshine
8
UV index (Very High)
47
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
14
mph wind from E

Union Island weather for Friday 23rd January 2026

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 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 49% chance of some rain and a moderate breeze of 14 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
5
hours of sunshine
9
UV index (Very High)
49
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
14
mph wind from E

Union Island weather for Saturday 24th January 2026

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 5-10 mm of rainfall expected with 61% chance of some rain and a moderate breeze of 17 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
6
hours of sunshine
9
UV index (Very High)
61
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
17
mph wind from E

Union Island weather for Sunday 25th January 2026

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 7 hours of bright sunshine. There are 5-10 mm of rainfall expected with 59% chance of some rain and a moderate breeze of 17 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
7
hours of sunshine
9
UV index (Very High)
59
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
17
mph wind from E

Union Island weather for Monday 26th January 2026

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 10 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 17 mph from the east.