UV Index for San Francisco, CA

Current San Francisco UV Index

0 (Low)

Last Updated 20 minutes ago

Hourly San Francisco UV Index

The hourly San Francisco, CA UV Index forecast for Wednesday, April 23rd, 2025.

5 Day Hourly San Francisco UV Index Forecast

Last Updated 9 hours ago

The UV index forecast for the next five days in San Francisco, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in San Francisco over the next five days will be 5.6 on Thursday, April 24th at 2:00 pm.

The UV index forecast for Wednesday, April 23rd in San Francisco, CA is below.

Time UV Index Risk
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, April 24th in San Francisco, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.2
Low
9am 0.6
Low
10am 1.2
Low
11am 2.2
Low
12pm 3.2
Moderate
1pm 4.4
Moderate
2pm 5.6
Moderate
3pm 4.1
Moderate
4pm 2.4
Low
5pm 1.2
Low
6pm 0.5
Low
7pm 0.1
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, April 25th in San Francisco, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.2
Low
9am 0.6
Low
10am 1.4
Low
11am 3
Moderate
12pm 4.4
Moderate
1pm 5.3
Moderate
2pm 5.3
Moderate
3pm 4.4
Moderate
4pm 3.4
Moderate
5pm 1.8
Low
6pm 0.8
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, April 26th in San Francisco, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.1
Low
9am 0.6
Low
10am 1.9
Low
11am 2.9
Low
12pm 4.2
Moderate
1pm 5
Moderate
2pm 4.9
Moderate
3pm 3.7
Moderate
4pm 2.4
Low
5pm 1.6
Low
6pm 0.7
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, April 27th in San Francisco, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
View Historical UV Index Data