UV Index for San Francisco, CA

Current San Francisco UV Index

0 (Low)

Last Updated 5 minutes ago

Hourly San Francisco UV Index

The hourly San Francisco, CA UV Index forecast for Saturday, February 21st, 2026.

5 Day Hourly San Francisco UV Index Forecast

Last Updated 15 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 4 on Monday, February 23rd at 12:00 pm.

The UV index forecast for Saturday, February 21st in San Francisco, CA is below.

Time UV Index Risk
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.4
Low
9am 1.1
Low
10am 2.4
Low
11am 3.4
Moderate
12pm 3.8
Moderate
1pm 3.2
Moderate
2pm 2.3
Low
3pm 1.6
Low
4pm 0.7
Low
5pm 0.2
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, February 22nd 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 0.7
Low
10am 1.7
Low
11am 2.4
Low
12pm 2.2
Low
1pm 2.4
Low
2pm 1.7
Low
3pm 1.4
Low
4pm 0.6
Low
5pm 0.2
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, February 23rd 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 0.5
Low
9am 1.4
Low
10am 2.8
Low
11am 3.6
Moderate
12pm 4
Moderate
1pm 3.8
Moderate
2pm 2.1
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0.1
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, February 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
View Historical UV Index Data