Union Island, Saint Vincent and the Grenadines: vitamin D, best months and travel guide
Gateway to Tobago Cays and a kitesurf spot. Best for: sailors, kitesurfers.
The best months for vitamin D in Union Island are February to May, September, when a full dose takes about 6 minutes at midday. Rainy or stormy from June to August and from October to January.
Union Island month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Bad weather | 7.6 h | 7.5 | 7 min | 28°C | 20/30 |
| February | Excellent | 8.1 h | 8.4 | 6 min | 27°C | 1/30 |
| March | Excellent | 8.6 h | 9.1 | 6 min | 27°C | 6/30 |
| April | Excellent | 8.7 h | 9.2 | 6 min | 28°C | 6/30 |
| May | Excellent | 8.7 h | 8.9 | 6 min | 29°C | 5/30 |
| June | Bad weather | 8.7 h | 8.6 | 6 min | 29°C | 20/30 |
| July | Bad weather | 8.3 h | 8.4 | 6 min | 29°C | 20/30 |
| August | Bad weather | 8.5 h | 8.9 | 6 min | 29°C | 22/30 |
| September | Excellent | 8.4 h | 8.7 | 6 min | 30°C | 17/30 |
| October | Bad weather | 8.2 h | 8.3 | 6 min | 30°C | 21/30 |
| November | Bad weather | 7.7 h | 7.5 | 7 min | 29°C | 22/30 |
| December | Bad weather | 7.4 h | 7.0 | 8 min | 28°C | 18/30 |
Sun window is the number of hours a day with UV Index 2.5 or higher. Full dose is the minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, for skin type III. Rainy days are days with at least 1 mm out of 30.
What to expect in Union Island
Gateway to Tobago Cays and a kitesurf spot. A dry, breezy season from January to May, and hurricane risk from June to November. Island hopping is by small boat or short flight, and there are fewer large hotels.
In Union Island afternoon highs average from 27°C in February to 30°C in October. The wettest month is August (about 22 rainy days out of 30) and the driest is February (1). Midday UV peaks at 9.2 in April, which is very strong, so protect your skin.
More about Saint Vincent and the Grenadines · Saint Vincent and the Grenadines in April · Best places in April
Questions about Union Island
When is the best time to visit Union Island for vitamin D?
The best months for vitamin D in Union Island are February to May, September, when a full dose takes about 6 minutes at midday.
What is the weather like in Union Island?
Afternoon highs average from 27°C in February to 30°C in October. The wettest month is August, with about 22 rainy days out of 30.
Which months should I avoid in Union Island?
For a beach stay, avoid the months when it is rainy or stormy from June to August and from October to January.