UV Index for Palo Alto, CA

Current Palo Alto UV Index

0 (Low)

Last Updated 11 minutes ago

Hourly Palo Alto UV Index

The hourly Palo Alto, CA UV Index forecast for Wednesday, September 17th, 2025.

5 Day Hourly Palo Alto UV Index Forecast

Last Updated 19 hours ago

The UV index forecast for the next five days in Palo Alto, CA has no days reaching the extreme level and 1 day reaching the high or very high levels. The peak UV intensity in Palo Alto over the next five days will be 6.8 on Wednesday, September 17th at 1:00 pm.

The UV index forecast for Wednesday, September 17th in Palo Alto, CA is below.

Time UV Index Risk
7am 0
Low
8am 0.3
Low
9am 1.2
Low
10am 2.9
Low
11am 4.7
Moderate
12pm 6.2
High
1pm 6.8
High
2pm 6.3
High
3pm 4.6
Moderate
4pm 3
Moderate
5pm 1.2
Low
6pm 0.4
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, September 18th in Palo Alto, 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
Low
11am 2.2
Low
12pm 3.1
Moderate
1pm 2.3
Low
2pm 1.9
Low
3pm 1.6
Low
4pm 2.3
Low
5pm 0.5
Low
6pm 0.1
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, September 19th in Palo Alto, 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
Low
9am 0.2
Low
10am 0.4
Low
11am 0.9
Low
12pm 1.1
Low
1pm 1.3
Low
2pm 1.4
Low
3pm 1.3
Low
4pm 1
Low
5pm 0.8
Low
6pm 0.3
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, September 20th in Palo Alto, 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