Vitamin D in Cayman Islands in September: sun, UV and what to expect
Bad weather Bad weather: September is a peak month for tropical storms here, so a beach stay is not recommended. If you still go, check forecasts and travel insurance.
7.6 hsun window (UV 2.5+)
7.9peak UV Index
7 minto a full dose
31°Cafternoon high
24/30rainy days
27/30sunny days
Open Cayman Islands for September on the map Find stays in Cayman Islands
How long in the sun in September?
- If you travel anyway, plan your sun session around midday (roughly 11:00 to 15:00), when the UV Index peaks at about 7.9. With about a quarter of your skin bare, a full dose takes around 7 minutes for skin type III at age 30, and about 13 minutes at age 65.
- Stop well before your skin turns pink. At this UV level skin type III can start to burn after about 25 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 8.7, 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 | 5 min | 8 min | 17 min |
| Type II | 6 min | 11 min | 21 min |
| Type III | 7 min | 13 min | 25 min |
| Type IV | 10 min | 19 min | 38 min |
| Type V | 14 min | 25 min | 51 min |
| Type VI | 23 min | 42 min | 84 min |
Minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, at Seven Mile Beach, 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 Cayman Islands in September
| Place | Rating | Sun window | Full dose | Afternoon high | Rainy days |
|---|---|---|---|---|---|
| Cayman Brac | Bad weather | 7.7 h | 7 min | 30°C | 19/30 |
| West Bay | Bad weather | 7.6 h | 7 min | 31°C | 24/30 |
| Seven Mile Beach | Bad weather | 7.6 h | 7 min | 31°C | 24/30 |
| Stingray City | Bad weather | 7.6 h | 7 min | 31°C | 24/30 |
| George Town | Bad weather | 7.6 h | 7 min | 31°C | 24/30 |
Other months in Cayman Islands
- Jan Good
- Feb Excellent
- Mar Bad weather
- Apr Excellent
- May Excellent
- Jun Bad weather
- Jul Bad weather
- Aug Excellent
- Sep Bad weather
- Oct Bad weather
- Nov Bad weather
- Dec Good
Best months: April, May, August, December to February. Full Cayman Islands guide