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.

Sunday
19th Apr
79

79

5

11
Monday
20th Apr
79

79

7

11
Tuesday
21st Apr
79

79

7

11
Wednesday
22nd Apr
79

79

7

11
Thursday
23rd Apr
79

79

8

11

5-day weather forecast updated at 04:01 on Sunday 19th April 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 Sunday 19th April 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 11+ (Extreme) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 36% chance of some rain and a moderate breeze of 15 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
5
hours of sunshine
11
UV index (Extreme)
36
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
15
mph wind from E

Union Island weather for Monday 20th April 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 11+ (Extreme) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 40% chance of some rain and a moderate breeze of 14 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
7
hours of sunshine
11
UV index (Extreme)
40
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
14
mph wind from E

Union Island weather for Tuesday 21st April 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 11+ (Extreme) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 12 mph from the east.

79
°F maximum temperature
79
°F minimum temperature
broken clouds
7
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
12
mph wind from E

Union Island weather for Wednesday 22nd April 2026

79
°F maximum temperature
79
°F minimum temperature
broken clouds
7
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
11
mph wind from E

Union Island weather for Thursday 23rd April 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 11+ (Extreme) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 38% chance of some rain and a gentle breeze of 9 mph from the east.