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.

Friday
9th Jan
79

79

6

8
Saturday
10th Jan
79

79

7

9
Sunday
11th Jan
79

79

6

9
Monday
12th Jan
79

79

7

9
Tuesday
13th Jan
79

77

4

9

5-day weather forecast updated at 04:01 on Friday 9th 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 Friday 9th 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 8 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 16 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
broken clouds
6
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
16
mph wind from E

Union Island weather for Saturday 10th 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 9 (Very High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 16 mph from the north-east.

79
°F maximum temperature
79
°F minimum temperature
broken clouds
7
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
16
mph wind from NE

Union Island weather for Sunday 11th 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 9 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 15 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
15
mph wind from E

Union Island weather for Monday 12th January 2026

79
°F maximum temperature
79
°F minimum temperature
broken clouds
7
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
12
mph wind from E

Union Island weather for Tuesday 13th 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 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 58% chance of some rain and a moderate breeze of 14 mph from the east.