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.

Friday
17th Apr
27

26

2

4
Saturday
18th Apr
27

26

5

11
Sunday
19th Apr
26

26

7

11
Monday
20th Apr
26

26

6

11
Tuesday
21st Apr
26

26

7

11

5-day weather forecast updated at 04:07 on Friday 17th 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 Friday 17th April 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 4 (Moderate) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 19% chance of some rain and a fresh breeze of 29 kph from the east.

27
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
4
UV index (Moderate)
19
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
29
kph wind from E

Union Island weather for Saturday 18th April 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 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 23% chance of some rain and a moderate breeze of 24 kph from the east.

27
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
11
UV index (Extreme)
23
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
24
kph wind from E

Union Island weather for Sunday 19th April 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 11+ (Extreme) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 43% 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
11
UV index (Extreme)
43
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
25
kph wind from E

Union Island weather for Monday 20th April 2026

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 11 (Extreme) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the east.

26
°C maximum temperature
26
°C minimum temperature
broken clouds
6
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
24
kph 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 26°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 gentle breeze of 19 kph from the east.