UV Index Today

Real-time solar radiation monitoring

San Francisco, California, United States
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San Francisco

California, United States • Local time: 10:03

Live UV Index
10:00
3.7
Moderate
Peak 7.0 at 13:00

Temp

16.9°C
Cloudy

Status

Cloudy

Max

21.0°C

Next 3 Hours

5.4
11:00
6.5
12:00
7.0
13:00

Humidity

79%

Cloud

58%

Wind Spd

11.4km/h

"Moderate risk. Seek shade near midday."

Today's UV Forecast

Hourly prediction for San Francisco · Peak 7.0 at 13:00

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00
—
01
—
02
—
03
—
04
—
05
—
06
0.1
07
0.7
08
1.9
09
3.7
10
5.4
11
6.5
12
7.0
13
6.7
14
6.3
15
5.3
16
4.1
17
2.4
18
1.1
19
0.1
20
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21
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22
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23

Sunburn Time & SPF

Estimate burn time for your skin type at UV 3.7 in San Francisco.

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Location Map

37.7633, -122.4129 · Elev. 18 m · America/Los_Angeles

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Live UV Index in San Francisco

This page shows the live UV index for San Francisco, California, United States. Use the current reading, today's peak estimate, and the all-day hourly forecast to plan outdoor time and sun protection in San Francisco.

UV intensity can change quickly around midday. Check the peak time and hourly bars for San Francisco before long outdoor activities, and increase protection when the index moves into High or above.

Planning Outdoor Time in San Francisco

Pair the live UV index with temperature, cloud cover, and wind to judge comfort and exposure risk. Even on cooler or breezy days, high UV can still cause skin damage.

Want nearby comparisons? Browse all cities in California.