Vitamin D in Cuba in July: sun, UV and what to expect
Too hot Too hot here in July: afternoon highs average 32°C (feels like 39°C). Heat stress is a real risk, so a beach stay is not recommended. Try another month or destination.
9.2 hsun window (UV 2.5+)
8.8peak UV Index
6 minto a full dose
32°Cafternoon high
0/30rainy days
30/30sunny days
The country rating is for a typical beach, but some places in Cuba still work in July: Cayo Coco (excellent), Trinidad (excellent), Santiago de Cuba (excellent).
How long in the sun in July?
- If you travel anyway, plan your sun session around midday (roughly 11:00 to 15:00), when the UV Index peaks at about 8.8. With about a quarter of your skin bare, a full dose takes around 6 minutes for skin type III at age 30, and about 11 minutes at age 65.
- Stop well before your skin turns pink. At this UV level skin type III can start to burn after about 23 minutes of midday sun, so cover up, find shade and use SPF 30+ on skin that stays out.
- On clear days the UV Index reaches about 9.0, which is very strong. Keep sessions short and protect the rest of the day.
- Water, sand and light surfaces reflect UV, so at the beach you get a little more sun than the number suggests, for the good and the bad.
| Skin type | Full dose, age 30 | Full dose, age 65 | Time to burn |
|---|---|---|---|
| Type I | 4 min | 8 min | 15 min |
| Type II | 5 min | 9 min | 19 min |
| Type III | 6 min | 11 min | 23 min |
| Type IV | 9 min | 17 min | 34 min |
| Type V | 12 min | 23 min | 45 min |
| Type VI | 20 min | 38 min | 76 min |
Minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, at Cayo Santa María, the median coastal place. Time to burn is the time to reach one minimal erythemal dose and does not depend on age. A rough planning guide, not medical advice.
Places in Cuba in July
| Place | Rating | Sun window | Full dose | Afternoon high | Rainy days |
|---|---|---|---|---|---|
| Cayo Coco | Excellent | 9.1 h | 6 min | 31°C | 11/30 |
| Trinidad | Excellent | 9.0 h | 6 min | 33°C | 16/30 |
| Santiago de Cuba | Excellent | 8.8 h | 6 min | 32°C | 17/30 |
| Cayo Santa María | Too hot | 9.2 h | 6 min | 32°C | 0/30 |
| Varadero | Too hot | 9.2 h | 6 min | 33°C | 0/30 |
| Cienfuegos | Too hot | 8.8 h | 6 min | 34°C | 13/30 |
| Havana | Too hot | 9.2 h | 6 min | 34°C | 16/30 |
| Viñales | Bad weather | 9.1 h | 6 min | 32°C | 20/30 |
Other months in Cuba
- Jan Good
- Feb Excellent
- Mar Excellent
- Apr Excellent
- May Excellent
- Jun Bad weather
- Jul Too hot
- Aug Bad weather
- Sep Bad weather
- Oct Bad weather
- Nov Good
- Dec Good
Best months: November to May. Full Cuba guide