Sunny Hours / UV index / US / San Francisco
UV index in San Francisco, CA today
Today's peak UV index in San Francisco is 6 (high), around 1pm. It is 3 or above from 11am to 5pm, which is when the EPA recommends protecting your skin. Tomorrow's peak is 6 (high).
- UV now6 (high)
- Peak today6 (high)
- Time of peakAround 1pm
- Hours at 3 or above6
- Sunrise7:12 am
- Sunset6:40 pm
UV index in San Francisco by hour, next 7 days
Each square is one daylight hour and the number in it is the UV index for that hour. The numbers across the top are the hour of the day.
| 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Today | 0 | 0 | 1 | 2 | 4 | 5 | 6 | 6 | 5 | 4 | 2 | 1 |
| Sat, Oct 10 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 5 | 4 | 2 | 1 |
| Sun, Oct 11 | 0 | 0 | 1 | 2 | 4 | 5 | 5 | 5 | 5 | 4 | 2 | 1 |
| Mon, Oct 12 | 0 | 0 | 1 | 2 | 4 | 5 | 5 | 5 | 5 | 4 | 2 | 1 |
| Tue, Oct 13 | 0 | 0 | 1 | 2 | 4 | 5 | 5 | 5 | 5 | 4 | 2 | 1 |
| Wed, Oct 14 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 5 | 4 | 3 | 2 | 1 |
| Thu, Oct 15 | 0 | 0 | 1 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 2 | 1 |
- Low (1 to 2)
- Moderate (3 to 5)
- High (6 to 7)
- Very high (8 to 10)
Day by day
| Day | Peak UV | Level | At 3 or above | Sunrise | Sunset |
|---|---|---|---|---|---|
| Today | 6 | high | 11am to 5pm | 7:12 am | 6:40 pm |
| Sat, Oct 10 | 6 | high | 11am to 5pm | 7:13 am | 6:39 pm |
| Sun, Oct 11 | 5 | moderate | 11am to 5pm | 7:14 am | 6:37 pm |
| Mon, Oct 12 | 5 | moderate | 11am to 5pm | 7:15 am | 6:36 pm |
| Tue, Oct 13 | 5 | moderate | 11am to 5pm | 7:16 am | 6:34 pm |
| Wed, Oct 14 | 5 | moderate | 11am to 5pm | 7:17 am | 6:33 pm |
| Thu, Oct 15 | 5 | moderate | 10am to 5pm | 7:18 am | 6:32 pm |
What today's level means
Today's peak of 6 is in the high band. The guidance for that band is: seek shade around midday, cover up and wear sunscreen. The EPA recommends protecting your skin whenever the index is 3 or higher, and you can burn even when it is cloudy.
The UV index depends mostly on how high the sun is in the sky, so it peaks around the middle of the day and is far higher in summer than in winter. It is not the same as temperature. For the full scale and what it means for tanning and burning, see what the UV index numbers mean.
UV tells you how strong the sun is, not whether it will be out. For that, see the sunshine forecast for San Francisco.
UV index in other cities
UV forecast for San Francisco, California. Updated October 9 at 1:42 PM. This is a forecast, not a measurement. Weather data by Open-Meteo.