Vitamin D in California in August: sun, UV and what to expect
Excellent Excellent. The sun is strong for most of the day in California in August, so a full vitamin D dose takes only about 7 minutes at midday, and the usable window lasts 8.7 hours a day.
8.7 hsun window (UV 2.5+)
7.5peak UV Index
7 minto a full dose
23°Cafternoon high
1/30rainy days
30/30sunny days
Best places in California in August: La Jolla (excellent), Laguna Beach (excellent), Los Angeles (excellent), San Diego (excellent), Malibu (excellent).
Open California for August on the map Find stays in California
How long in the sun in August?
- Plan your sun session around midday (roughly 11:00 to 15:00), when the UV Index peaks at about 7.5. 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 27 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 8.0, 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 | 5 min | 9 min | 18 min |
| Type II | 6 min | 11 min | 22 min |
| Type III | 7 min | 13 min | 27 min |
| Type IV | 11 min | 20 min | 40 min |
| Type V | 14 min | 27 min | 53 min |
| Type VI | 24 min | 44 min | 89 min |
Minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, at Santa Monica, 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 California in August
| Place | Rating | Sun window | Full dose | Afternoon high | Rainy days |
|---|---|---|---|---|---|
| La Jolla | Excellent | 8.9 h | 7 min | 24°C | 0/30 |
| Laguna Beach | Excellent | 8.9 h | 7 min | 24°C | 0/30 |
| Los Angeles | Excellent | 9.0 h | 7 min | 31°C | 0/30 |
| San Diego | Excellent | 8.7 h | 7 min | 26°C | 0/30 |
| Malibu | Excellent | 8.9 h | 7 min | 24°C | 0/30 |
| Santa Monica | Excellent | 8.7 h | 7 min | 23°C | 1/30 |
| Santa Barbara | Excellent | 8.8 h | 7 min | 25°C | 0/30 |
| Santa Cruz | Excellent | 8.6 h | 7 min | 24°C | 0/30 |
| Monterey | Too cold | 8.8 h | 7 min | 20°C | 0/30 |
| Carmel-by-the-Sea | Too cold | 8.7 h | 7 min | 20°C | 0/30 |
Other months in California
- Jan Too cold
- Feb Too cold
- Mar Too cold
- Apr Too cold
- May Too cold
- Jun Too cold
- Jul Excellent
- Aug Excellent
- Sep Excellent
- Oct Good
- Nov Too cold
- Dec Too cold
Best months: July to October. Full California guide