UV Index for San Mateo, CA

Current San Mateo UV Index

0.6 (Low)

Last Updated 12 minutes ago

Hourly San Mateo UV Index

The hourly San Mateo, CA UV Index forecast for Thursday, December 11th, 2025.

5 Day Hourly San Mateo UV Index Forecast

Last Updated 23 hours ago

The UV index forecast for the next five days in San Mateo, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in San Mateo over the next five days will be 2.3 on Thursday, December 11th at 12:00 pm.

The UV index forecast for Thursday, December 11th in San Mateo, CA is below.

Time UV Index Risk
10am 1.3
Low
11am 2
Low
12pm 2.3
Low
1pm 2.1
Low
2pm 1.5
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, December 12th in San Mateo, 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 0.5
Low
10am 1.2
Low
11am 1.9
Low
12pm 2.2
Low
1pm 2.1
Low
2pm 1.5
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, December 13th in San Mateo, 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 1.2
Low
11am 1.8
Low
12pm 2.2
Low
1pm 2
Low
2pm 1.4
Low
3pm 0.7
Low
4pm 0.2
Low
5pm 0
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, December 14th in San Mateo, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low