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.

Friday
20th Mar
26

25

6

11
Saturday
21st Mar
26

25

9

11
Sunday
22nd Mar
26

25

8

11
Monday
23rd Mar
26

25

7

11
Tuesday
24th Mar
26

25

5

11

5-day weather forecast updated at 04:01 on Friday 20th March 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 20th March 2026

Expect sunshine and showers in Union Island, St Vincent & the Grenadines with a maximum temperature of 26°C, maximum UV of 11+ (Extreme) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 30% chance of some rain and a moderate breeze of 25 kph from the east.

26
°C maximum temperature
25
°C minimum temperature
sunshine and showers
6
hours of sunshine
11
UV index (Extreme)
30
% chance of some rain
<5
mm of rainfall expected
26
°C wind chill
25
kph wind from E

Union Island weather for Saturday 21st March 2026

Expect scattered 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 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 25 kph from the east.

26
°C maximum temperature
25
°C minimum temperature
scattered clouds
9
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
25
kph wind from E

Union Island weather for Sunday 22nd March 2026

Expect scattered 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 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the east.

26
°C maximum temperature
25
°C minimum temperature
scattered clouds
8
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
20
kph wind from E

Union Island weather for Monday 23rd March 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 moderate breeze of 22 kph from the east.

26
°C maximum temperature
25
°C minimum temperature
broken clouds
7
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
22
kph wind from E

Union Island weather for Tuesday 24th March 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 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 42% chance of some rain and a moderate breeze of 23 kph from the east.