UV Index for Fullerton, CA

Current Fullerton UV Index

0 (Low)

Last Updated 39 minutes ago

Hourly Fullerton UV Index

The hourly Fullerton, CA UV Index forecast for Tuesday, August 19th, 2025.

5 Day Hourly Fullerton UV Index Forecast

Last Updated 11 hours ago

The UV index forecast for the next five days in Fullerton, CA has no days reaching the extreme level and 4 days reaching the high or very high levels. The peak UV intensity in Fullerton over the next five days will be 10.4 on Tuesday, August 19th at 1:00 pm.

The UV index forecast for Tuesday, August 19th in Fullerton, CA is below.

Time UV Index Risk
11pm 0
Low

The UV index forecast for Wednesday, August 20th in Fullerton, 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 1
Low
9am 2.7
Low
10am 5.2
Moderate
11am 7.7
High
12pm 9.3
Very High
1pm 9.6
Very High
2pm 9.1
Very High
3pm 6.9
High
4pm 4.3
Moderate
5pm 2
Low
6pm 0.7
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, August 21st in Fullerton, 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 0.8
Low
9am 2.4
Low
10am 4.8
Moderate
11am 7.2
High
12pm 9.3
Very High
1pm 9.9
Very High
2pm 9
Very High
3pm 6.9
High
4pm 4.3
Moderate
5pm 2
Low
6pm 0.6
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, August 22nd in Fullerton, 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 0.8
Low
9am 2.4
Low
10am 5
Moderate
11am 7.5
High
12pm 9.3
Very High
1pm 9.9
Very High
2pm 9
Very High
3pm 6.8
High
4pm 4.2
Moderate
5pm 2
Low
6pm 0.6
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, August 23rd in Fullerton, 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