UV Index for Altadena, CA

Current Altadena UV Index

0 (Low)

Last Updated 59 minutes ago

Hourly Altadena UV Index

The hourly Altadena, CA UV Index forecast for Saturday, July 12th, 2025.

5 Day Hourly Altadena UV Index Forecast

Last Updated 13 hours ago

The UV index forecast for the next five days in Altadena, CA has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Altadena over the next five days will be 10.7 on Sunday, July 13th at 1:00 pm.

The UV index forecast for Saturday, July 12th in Altadena, CA is below.

Time UV Index Risk
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0.4
Low
8am 1.4
Low
9am 3.4
Moderate
10am 6
High
11am 8.8
Very High
12pm 10.2
Very High
1pm 10.4
Very High
2pm 9.7
Very High
3pm 7.8
High
4pm 5.1
Moderate
5pm 2.8
Low
6pm 1.1
Low
7pm 0.3
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, July 13th in Altadena, 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 0.4
Low
8am 1.5
Low
9am 3.5
Moderate
10am 6.2
High
11am 8.8
Very High
12pm 10.2
Very High
1pm 10.7
Very High
2pm 9.8
Very High
3pm 7.9
High
4pm 5.3
Moderate
5pm 2.9
Low
6pm 1.2
Low
7pm 0.3
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, July 14th in Altadena, 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 0.4
Low
8am 1.4
Low
9am 3.4
Moderate
10am 6.1
High
11am 8.5
Very High
12pm 10
Very High
1pm 10.6
Very High
2pm 9.8
Very High
3pm 7.8
High
4pm 5.2
Moderate
5pm 2.8
Low
6pm 1.2
Low
7pm 0.3
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, July 15th in Altadena, 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