Union Island weather live forecast

Today's maximum temperature in Union Island is expected to be 28°C. Select a day from the live weather forecast for Union Island, St Vincent & the Grenadines for more weather parameters.

Tuesday
28th Jul
28

27

5

10
Wednesday
29th Jul
28

27

5

9
Thursday
30th Jul
28

27

6

11
Friday
31st Jul
27

27

6

10
Saturday
1st Aug
27

27

6

11

5-day weather forecast updated at 04:01 on Tuesday 28th July 2026 GMT

More about Union Island

Union Island by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for St Vincent & the Grenadines

Marella Cruises: Best deals on summer sailings

Sale

Check out best deals on all-inclusive summer sailings
Book cruises to the Med including 30th Birthday sailings
Filter deals by departure port, party size & duration

Go to Marella Cruises deal >>

View all Marella Cruises offers

Cruise deal finder

Destination

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 Tuesday 28th July 2026

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 10 (Very High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 25 kph from the east.

28
°C maximum temperature
27
°C minimum temperature
broken clouds
5
hours of sunshine
10
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
25
kph wind from E

Union Island weather for Wednesday 29th July 2026

Expect isolated thunderstorms in Union Island, St Vincent & the Grenadines with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 76% chance of some rain and a fresh breeze of 32 kph from the east.

28
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
9
UV index (Very High)
76
% chance of some rain
<20
mm of rainfall expected
L
low heat & humidity
32
kph wind from E

Union Island weather for Thursday 30th July 2026

Expect broken clouds in Union Island, St Vincent & the Grenadines with a maximum temperature of 28°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 fresh breeze of 33 kph from the east.

28
°C maximum temperature
27
°C minimum temperature
broken clouds
6
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
L
low heat & humidity
33
kph wind from E

Union Island weather for Friday 31st July 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 10 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 49% chance of some rain and a moderate breeze of 26 kph from the east.

27
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
10
UV index (Very High)
49
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
26
kph wind from E

Union Island weather for Saturday 1st August 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 5-10 mm of rainfall expected with 53% chance of some rain and a moderate breeze of 20 kph from the east.