Key West, Florida: vitamin D, best months and travel guide
Southernmost town, with sunsets, bars and snorkelling trips. Best for: couples, groups, anglers.
The best months for vitamin D in Key West are November to June, when a full dose takes about 6 minutes at midday. Too hot from July to August and rainy or stormy from September to October.
Key West month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Good | 6.0 h | 5.4 | 10 min | 25°C | 3/30 |
| February | Good | 6.8 h | 6.5 | 8 min | 26°C | 2/30 |
| March | Excellent | 7.8 h | 7.8 | 7 min | 28°C | 4/30 |
| April | Excellent | 8.5 h | 8.5 | 6 min | 29°C | 4/30 |
| May | Excellent | 9.2 h | 8.9 | 6 min | 31°C | 3/30 |
| June | Excellent | 8.7 h | 8.4 | 6 min | 32°C | 8/30 |
| July | Too hot | 9.1 h | 8.6 | 6 min | 33°C | 7/30 |
| August | Too hot | 8.3 h | 8.1 | 7 min | 33°C | 10/30 |
| September | Bad weather | 7.8 h | 7.8 | 7 min | 32°C | 7/30 |
| October | Bad weather | 7.0 h | 6.7 | 8 min | 30°C | 7/30 |
| November | Good | 6.2 h | 5.6 | 10 min | 28°C | 2/30 |
| December | Good | 5.2 h | 4.7 | 11 min | 25°C | 5/30 |
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 Key West
Southernmost town, with sunsets, bars and snorkelling trips. A dry, mild season from November to April, and a hot, humid, stormy summer with hurricane risk from June to November. The Gulf coast has calm, shallow water, and the Atlantic coast has more waves. Car hire is usually needed.
In Key West afternoon highs average from 25°C in December to 33°C in July. The wettest month is August (about 10 rainy days out of 30) and the driest is November (2). Midday UV peaks at 8.9 in May, which is very strong, so protect your skin.
Questions about Key West
When is the best time to visit Key West for vitamin D?
The best months for vitamin D in Key West are November to June, when a full dose takes about 6 minutes at midday.
What is the weather like in Key West?
Afternoon highs average from 25°C in December to 33°C in July. The wettest month is August, with about 10 rainy days out of 30.
Which months should I avoid in Key West?
For a beach stay, avoid the months when it is too hot from July to August and rainy or stormy from September to October.