Union Island weather live forecast

Today's maximum temperature in Union Island is expected to be 26°C. Select a day from the live weather forecast for Union Island, St Vincent & the Grenadines for more weather parameters.

Monday
19th Jan
26

26

7

8
Tuesday
20th Jan
26

26

5

10
Wednesday
21st Jan
26

26

4

10
Thursday
22nd Jan
26

26

4

10

5-day weather forecast updated at 04:02 on Saturday 17th 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 Monday 19th January 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 26°C, 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 32% chance of some rain and a moderate breeze of 25 kph from the east.

26
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
8
UV index (Very High)
32
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
25
kph wind from E

Union Island weather for Tuesday 20th January 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 10 (Very High) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 52% chance of some rain and a moderate breeze of 21 kph from the east.

26
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
10
UV index (Very High)
52
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
21
kph wind from E

Union Island weather for Wednesday 21st January 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 10 (Very High) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 59% chance of some rain and a moderate breeze of 24 kph from the east.

26
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
10
UV index (Very High)
59
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
24
kph wind from E

Union Island weather for Thursday 22nd January 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 10 (Very High) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 69% chance of some rain and a moderate breeze of 24 kph from the east.