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
8th Jul
27

27

5

9
Thursday
9th Jul
27

27

6

7
Friday
10th Jul
28

27

6

9
Saturday
11th Jul
27

27

7

8
Sunday
12th Jul
27

27

5

11

5-day weather forecast updated at 04:01 on Wednesday 8th 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 Wednesday 8th 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 9 (Very High) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 75% chance of some rain and a fresh breeze of 31 kph from the east.

27
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
9
UV index (Very High)
75
% chance of some rain
<20
mm of rainfall expected
L
low heat & humidity
31
kph wind from E

Union Island weather for Thursday 9th 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 7 (High) and 6 hours of bright sunshine. There are 10-20 mm of rainfall expected with 55% chance of some rain and a fresh breeze of 35 kph from the east.

27
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
7
UV index (High)
55
% chance of some rain
<20
mm of rainfall expected
L
low heat & humidity
35
kph wind from E

Union Island weather for Friday 10th 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 9 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 34 kph from the east.

28
°C maximum temperature
27
°C minimum temperature
broken clouds
6
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
34
kph wind from E

Union Island weather for Saturday 11th 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 8 (Very High) and 7 hours of bright sunshine. There are 5-10 mm of rainfall expected with 72% chance of some rain and a fresh breeze of 31 kph from the east.

27
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
8
UV index (Very High)
72
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
31
kph wind from E

Union Island weather for Sunday 12th 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 11 (Extreme) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 76% chance of some rain and a moderate breeze of 25 kph from the east.