Sunny Hours / UV index / US / San Francisco
UV index in San Francisco, CA today
Today's peak UV index in San Francisco is 5 (moderate), around 1pm. It is 3 or above from 11am to 5pm, which is when the EPA recommends protecting your skin. Tomorrow's peak is 5 (moderate).
- UV now5 (moderate)
- Peak today5 (moderate)
- Time of peakAround 1pm
- Hours at 3 or above6
- Sunrise7:19 am
- Sunset6:30 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 | 5 | 5 | 5 | 3 | 2 | 1 |
| Sat, Oct 17 | 0 | 0 | 1 | 2 | 4 | 5 | 5 | 5 | 5 | 3 | 2 | 1 |
| Sun, Oct 18 | 0 | 0 | 1 | 2 | 4 | 5 | 5 | 5 | 4 | 3 | 2 | 1 |
| Mon, Oct 19 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 5 | 4 | 3 | 2 | 1 |
| Tue, Oct 20 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 4 | 4 | 2 | 1 | 1 |
| Wed, Oct 21 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 5 | 4 | 3 | 2 | 1 |
| Thu, Oct 22 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 4 | 3 | 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 | 5 | moderate | 11am to 5pm | 7:19 am | 6:30 pm |
| Sat, Oct 17 | 5 | moderate | 11am to 5pm | 7:20 am | 6:29 pm |
| Sun, Oct 18 | 5 | moderate | 11am to 5pm | 7:21 am | 6:27 pm |
| Mon, Oct 19 | 5 | moderate | 11am to 5pm | 7:22 am | 6:26 pm |
| Tue, Oct 20 | 5 | moderate | 11am to 4pm | 7:23 am | 6:25 pm |
| Wed, Oct 21 | 5 | moderate | 11am to 5pm | 7:24 am | 6:23 pm |
| Thu, Oct 22 | 5 | moderate | 11am to 5pm | 7:25 am | 6:22 pm |
What today's level means
Today's peak of 5 is in the moderate 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 16 at 3:32 PM. This is a forecast, not a measurement. Weather data by Open-Meteo.