Vitamin D in Vietnam in June: sun, UV and what to expect
Too hot Too hot here in June: afternoon highs average 35°C (feels like 42°C). Heat stress is a real risk, so a beach stay is not recommended. Try another month or destination.
8.0 hsun window (UV 2.5+)
8.2peak UV Index
7 minto a full dose
35°Cafternoon high
17/30rainy days
28/30sunny days
How long in the sun in June?
- If you travel anyway, plan your sun session around midday (roughly 11:00 to 15:00), when the UV Index peaks at about 8.2. With about a quarter of your skin bare, a full dose takes around 7 minutes for skin type III at age 30, and about 12 minutes at age 65.
- Stop well before your skin turns pink. At this UV level skin type III can start to burn after about 24 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 8.9, 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 | 16 min |
| Type II | 5 min | 10 min | 20 min |
| Type III | 7 min | 12 min | 24 min |
| Type IV | 10 min | 18 min | 37 min |
| Type V | 13 min | 24 min | 49 min |
| Type VI | 22 min | 41 min | 81 min |
Minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, at Hoi An, 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 Vietnam in June
| Place | Rating | Sun window | Full dose | Afternoon high | Rainy days |
|---|---|---|---|---|---|
| Nha Trang | Too hot | 8.0 h | 7 min | 33°C | 13/30 |
| Da Nang | Too hot | 8.2 h | 7 min | 35°C | 16/30 |
| Mũi Né | Bad weather | 8.0 h | 7 min | 33°C | 19/30 |
| Huế | Too hot | 7.9 h | 7 min | 35°C | 16/30 |
| Hoi An | Too hot | 8.0 h | 7 min | 35°C | 17/30 |
| Côn Đảo | Bad weather | 6.8 h | 7 min | 30°C | 21/30 |
| Hạ Long Bay | Bad weather | 8.3 h | 7 min | 31°C | 27/30 |
| Ho Chi Minh City | Bad weather | 6.9 h | 7 min | 33°C | 24/30 |
| Phú Quốc | Bad weather | 7.3 h | 7 min | 30°C | 29/30 |
| Hanoi | Too hot | 6.9 h | 8 min | 33°C | 21/30 |
Other months in Vietnam
- Jan Good
- Feb Excellent
- Mar Excellent
- Apr Excellent
- May Too hot
- Jun Too hot
- Jul Too hot
- Aug Too hot
- Sep Bad weather
- Oct Bad weather
- Nov Bad weather
- Dec Bad weather
Best months: January to April. Full Vietnam guide