California, United States · 37.77, -122.42
Today's peak is high. Unprotected skin burns in about 25 min at the worst hour: stay in the shade around midday.
San Francisco sits at 37.8° N, in the northern hemisphere. Today's UV peaks at 6.6: the "high" band, which uvlevel.net treats as danger for unprotected skin at the worst hour.
San Francisco sees the widest UV swing of the year of any latitude band: a sharp summer peak around June and July, and a winter trough around December and January where midday UV can sit near zero for weeks at a time.
| Local time | UV index | Risk |
|---|---|---|
| 00:00 | 0 | No danger |
| 01:00 | 0 | No danger |
| 02:00 | 0 | No danger |
| 03:00 | 0 | No danger |
| 04:00 | 0 | No danger |
| 05:00 | 0 | No danger |
| 06:00 | 0 | No danger |
| 07:00 | 0.1 | No danger |
| 08:00 | 0.3 | No danger |
| 09:00 | 1.5 | No danger |
| 10:00 | 3.1 | Caution |
| 11:00 | 4.6 | Caution |
| 12:00 | 5.9 | Caution |
| 13:00 | 6.6 | Danger |
| 14:00 | 6.6 | Danger |
| 15:00 | 6 | Danger |
| 16:00 | 4.9 | Caution |
| 17:00 | 3.3 | Caution |
| 18:00 | 1.7 | No danger |
| 19:00 | 0.5 | No danger |
| 20:00 | 0 | No danger |
| 21:00 | 0 | No danger |
| 22:00 | 0 | No danger |
| 23:00 | 0 | No danger |
| Skin type | Time to burn |
|---|---|
| I · always burns, never tans | 20 min |
| II · burns easily | 25 min |
| III · burns sometimes | 35 min |
| IV · rarely burns | 45 min |
| V · brown skin | 1 h 01 min |
| VI · deeply pigmented | 1 h 41 min |
Yes. UV in San Francisco is forecast to reach 3 or higher from 09:58 to 17:11 local time today, peaking at 6.6.
UV is highest in San Francisco at around 14:00 local time today, reaching 6.6.
At today's peak of 6.6, fair skin (Fitzpatrick type II) with no sunscreen burns in about 25 min. Darker skin types take longer. See the table above for every type.
San Francisco sees the widest UV swing of the year of any latitude band: a sharp summer peak around June and July, and a winter trough around December and January where midday UV can sit near zero for weeks at a time.
Forecasts and elevation from Open-Meteo. The second UV opinion contains modified Copernicus Atmosphere Monitoring Service (CAMS) information; neither the European Commission nor ECMWF is responsible for how it is used here.
uvlevel.net gives general sun-safety guidance, not medical advice. Photosensitising medication, skin conditions, infants and a history of skin cancer all call for stricter limits than shown here.