UV Index for Portola Valley, CA

Current Portola Valley UV Index

0 (Low)

Last Updated 43 minutes ago

Hourly Portola Valley UV Index

The hourly Portola Valley, CA UV Index forecast for Friday, July 4th, 2025.

5 Day Hourly Portola Valley UV Index Forecast

Last Updated 15 hours ago

The UV index forecast for the next five days in Portola Valley, CA has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Portola Valley over the next five days will be 10.2 on Saturday, July 5th at 1:00 pm.

The UV index forecast for Friday, July 4th in Portola Valley, CA is below.

Time UV Index Risk
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0.3
Low
8am 1.1
Low
9am 2.5
Low
10am 4.6
Moderate
11am 6.7
High
12pm 8.6
Very High
1pm 9.4
Very High
2pm 9.1
Very High
3pm 7.6
High
4pm 5.4
Moderate
5pm 3.2
Moderate
6pm 1.5
Low
7pm 0.5
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, July 5th 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 0.3
Low
8am 1
Low
9am 2.6
Low
10am 4.7
Moderate
11am 6.9
High
12pm 9.3
Very High
1pm 10.2
Very High
2pm 9.6
Very High
3pm 7.9
High
4pm 5.5
Moderate
5pm 3.3
Moderate
6pm 1.5
Low
7pm 0.5
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, July 6th 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 0.2
Low
8am 0.7
Low
9am 1.4
Low
10am 2.8
Low
11am 4.8
Moderate
12pm 6.8
High
1pm 8
Very High
2pm 7.7
High
3pm 6.8
High
4pm 5
Moderate
5pm 3
Moderate
6pm 1.4
Low
7pm 0.4
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, July 7th 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