Union Island climate guide

Get the latest coronavirus (COVID-19) updates for St Vincent and the Grenadines with current travel advice, statistics and online resources.

Temperature in Union Island (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
29°C maximum daytime temperature in January in Union Island29
29°C maximum daytime temperature in February in Union Island29
29°C maximum daytime temperature in March in Union Island29
30°C maximum daytime temperature in April in Union Island30
30°C maximum daytime temperature in May in Union Island30
30°C maximum daytime temperature in June in Union Island30
30°C maximum daytime temperature in July in Union Island30
30°C maximum daytime temperature in August in Union Island30
30°C maximum daytime temperature in September in Union Island30
30°C maximum daytime temperature in October in Union Island30
30°C maximum daytime temperature in November in Union Island30
29°C maximum daytime temperature in December in Union Island29
Min temperature (night-time)
21°C minimum night-time temperature in January in Union Island21
21°C minimum night-time temperature in February in Union Island21
21°C minimum night-time temperature in March in Union Island21
22°C minimum night-time temperature in April in Union Island22
23°C minimum night-time temperature in May in Union Island23
23°C minimum night-time temperature in June in Union Island23
23°C minimum night-time temperature in July in Union Island23
23°C minimum night-time temperature in August in Union Island23
23°C minimum night-time temperature in September in Union Island23
23°C minimum night-time temperature in October in Union Island23
22°C minimum night-time temperature in November in Union Island22
21°C minimum night-time temperature in December in Union Island21
Sea temperature
27°C sea temperature in January in Union Island27
26°C sea temperature in February in Union Island26
27°C sea temperature in March in Union Island27
27°C sea temperature in April in Union Island27
27°C sea temperature in May in Union Island27
27°C sea temperature in June in Union Island27
28°C sea temperature in July in Union Island28
28°C sea temperature in August in Union Island28
29°C sea temperature in September in Union Island29
29°C sea temperature in October in Union Island29
28°C sea temperature in November in Union Island28
28°C sea temperature in December in Union Island28

Sunshine & Daylight in Union Island

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
11 hours of daylight per day in January in Union Island11
12 hours of daylight per day in February in Union Island12
12 hours of daylight per day in March in Union Island12
12 hours of daylight per day in April in Union Island12
13 hours of daylight per day in May in Union Island13
13 hours of daylight per day in June in Union Island13
13 hours of daylight per day in July in Union Island13
13 hours of daylight per day in August in Union Island13
12 hours of daylight per day in September in Union Island12
12 hours of daylight per day in October in Union Island12
12 hours of daylight per day in November in Union Island12
11 hours of daylight per day in December in Union Island11

Rainfall in Union Island

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
16 days with some rainfall in January in Union Island16
12 days with some rainfall in February in Union Island12
12 days with some rainfall in March in Union Island12
10 days with some rainfall in April in Union Island10
14 days with some rainfall in May in Union Island14
18 days with some rainfall in June in Union Island18
21 days with some rainfall in July in Union Island21
20 days with some rainfall in August in Union Island20
21 days with some rainfall in September in Union Island21
18 days with some rainfall in October in Union Island18
20 days with some rainfall in November in Union Island20
18 days with some rainfall in December in Union Island18
Average monthly rainfall (mm)
78 mm monthly rainfall in January in Union Island78
57 mm monthly rainfall in February in Union Island57
59 mm monthly rainfall in March in Union Island59
58 mm monthly rainfall in April in Union Island58
76 mm monthly rainfall in May in Union Island76
155 mm monthly rainfall in June in Union Island155
203 mm monthly rainfall in July in Union Island203
195 mm monthly rainfall in August in Union Island195
186 mm monthly rainfall in September in Union Island186
207 mm monthly rainfall in October in Union Island207
182 mm monthly rainfall in November in Union Island182
138 mm monthly rainfall in December in Union Island138

More climate for Union Island

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 10 (Very High) in January in Union Island10
UV (maximum) index 11+ (Extreme) in February in Union Island11
UV (maximum) index 11+ (Extreme) in March in Union Island11
UV (maximum) index 11+ (Extreme) in April in Union Island11
UV (maximum) index 11+ (Extreme) in May in Union Island11
UV (maximum) index 11+ (Extreme) in June in Union Island11
UV (maximum) index 11+ (Extreme) in July in Union Island11
UV (maximum) index 11+ (Extreme) in August in Union Island11
UV (maximum) index 11+ (Extreme) in September in Union Island11
UV (maximum) index 11 (Extreme) in October in Union Island11
UV (maximum) index 10 (Very High) in November in Union Island10
UV (maximum) index 9 (Very High) in December in Union Island9
Heat & Humidity
High heat & humidity in January in Union IslandH
High heat & humidity in February in Union IslandH
High heat & humidity in March in Union IslandH
High heat & humidity in April in Union IslandH
High heat & humidity in May in Union IslandH
High heat & humidity in June in Union IslandH
High heat & humidity in July in Union IslandH
Very high heat & humidity in August in Union IslandVH
Very high heat & humidity in September in Union IslandVH
Very high heat & humidity in October in Union IslandVH
High heat & humidity in November in Union IslandH
High heat & humidity in December in Union IslandH

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

What's the climate like in Union Island?

Union Island has a hot tropical climate with no dry season.

  • Top deals & discounts
  • Union Island weather overview
  • More destinations
  • Best time to go to Union Island
  • Union Island 5-day weather forecast
  • Union Island weather today - current conditions (last 24-hours)

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

The climate guide for Union Island, St Vincent & the Grenadines shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Recommended for St Vincent & the Grenadines

  • Save up to 9% on Marella Cruises to the Caribbean
  • Book online with TUI to receive the discount
  • Travel before 31st October 2021 (inclusive)

Metric (°C / mm)  |  Imperial (°F / inches)

Back to top

Discover more about St Vincent & the Grenadines

Where's hot in St Vincent & the Grenadines?

Below are average maximum temperatures at popular destinations in St Vincent & the Grenadines for next month - August. Select a destination to see the climate guide for all months of the year.

Related posts

Popular travel offers

Top ^

*affiliate links: find out how we are funded and why this helps us remain free to use.