Protection needed. Seek shade during late morning through mid-afternoon. When outside, generously apply broad-spectrum SPF-15 or higher sunscreen on exposed skin, and wear protective clothing, a wide-brimmed hat, and sunglasses.
Best time outdoors
Before 9:00 am & after
6:00 pm
Peak UV around
1:00 am, limit midday exposure.
Sunburn calculator
Select your skin type (Fitzpatrick scale):
Deep, almost never burns
Time to burn at UV 7
6h 47m
Unprotected skin.
SPF 30 extends this ~30×, SPF 50 ~50×,
when applied correctly.
Hourly UV · today
7-day Forecast
Today
7
Wed
3
Thu
6
Fri
7
Sat
7
Sun
7
Mon
7
UV scale & what to do
0–2LowNo protection needed
3–5ModerateNOWSPF 30+, hat at midday
6–7HighSPF 50+, shade 11–15h
8–10Very HighSPF 50+, limit exposure
11+ExtremeAvoid sun, full cover
UV Index FAQ
Today, Wednesday, October 21, the UV Index in
San Francisco, California is expected to reach about
7, which is considered
High.
Protection needed. Seek shade during late morning through mid-afternoon. When outside, generously apply broad-spectrum SPF-15 or higher sunscreen on exposed skin, and wear protective clothing, a wide-brimmed hat, and sunglasses..
The best time to be outdoors today is
before 9:00 am
and
after 6:00 pm,
when UV levels are lower. Try to limit prolonged sun exposure
around midday and early afternoon, when the UV Index is
typically at its highest.