UV Index for Portola Valley, CA

Current Portola Valley UV Index

0 (Low)

Last Updated 59 minutes ago

Hourly Portola Valley UV Index

The hourly Portola Valley, CA UV Index forecast for Tuesday, December 16th, 2025.

5 Day Hourly Portola Valley UV Index Forecast

Last Updated 21 hours ago

The UV index forecast for the next five days in Portola Valley, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Portola Valley over the next five days will be 2.5 on Tuesday, December 16th at 12:00 pm.

The UV index forecast for Tuesday, December 16th in Portola Valley, CA is below.

Time UV Index Risk
7am 0
Low
8am 0.1
Low
9am 0.5
Low
10am 1.2
Low
11am 2.2
Low
12pm 2.5
Low
1pm 2.3
Low
2pm 1.5
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 Wednesday, December 17th in Portola Valley, 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 0.4
Low
10am 0.8
Low
11am 1.6
Low
12pm 2.5
Low
1pm 2.3
Low
2pm 1.6
Low
3pm 0.8
Low
4pm 0.3
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 Thursday, December 18th in Portola Valley, 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 1.3
Low
11am 2
Low
12pm 2.5
Low
1pm 2.2
Low
2pm 1.6
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 19th in Portola Valley, CA is below.

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