UV Index for Altadena, CA

Current Altadena UV Index

0 (Low)

Last Updated 44 minutes ago

Hourly Altadena UV Index

The hourly Altadena, CA UV Index forecast for Friday, December 19th, 2025.

5 Day Hourly Altadena UV Index Forecast

Last Updated 16 hours ago

The UV index forecast for the next five days in Altadena, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Altadena over the next five days will be 3.2 on Saturday, December 20th at 12:00 pm.

The UV index forecast for Friday, December 19th in Altadena, CA is below.

Time UV Index Risk
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.3
Low
9am 1
Low
10am 2
Low
11am 2.8
Low
12pm 3.1
Moderate
1pm 2.7
Low
2pm 1.8
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 20th 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
Low
8am 0.3
Low
9am 1.1
Low
10am 2
Low
11am 2.8
Low
12pm 3.2
Moderate
1pm 2.6
Low
2pm 1.8
Low
3pm 0.9
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 21st 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
Low
8am 0.3
Low
9am 0.9
Low
10am 1.9
Low
11am 2.6
Low
12pm 2.6
Low
1pm 2.3
Low
2pm 1.2
Low
3pm 0.6
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 Monday, December 22nd in Altadena, CA is below.

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