Union Island weather live forecast

Today's maximum temperature in Union Island is expected to be 27°C. Select a day from the live weather forecast for Union Island, St Vincent & the Grenadines for more weather parameters.

Wednesday
20th May
27

27

7

UV11
Thursday
21st May
27

27

6

UV11
Friday
22nd May
27

27

7

UV11
Saturday
23rd May
27

26

7

UV11
Sunday
24th May
27

26

7

UV11

5-day weather forecast updated at 04:01 on Wednesday 20th May 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 Wednesday 20th May 2026

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, 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 fresh breeze of 29 kph from the east.

27
°C maximum temperature
27
°C minimum temperature
broken clouds
7
hours of sunshine
UV11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
29
kph wind from E

Union Island weather for Thursday 21st May 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 11+ (Extreme) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 29% chance of some rain and a moderate breeze of 27 kph from the east.

27
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
UV11
UV index (Extreme)
29
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
27
kph wind from E

Union Island weather for Friday 22nd May 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, 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 29% chance of some rain and a moderate breeze of 25 kph from the east.

27
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
UV11
UV index (Extreme)
29
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
25
kph wind from E

Union Island weather for Saturday 23rd May 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 11 (Extreme) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 33% chance of some rain and a moderate breeze of 23 kph from the east.