UV Index for Walnut, CA

Current Walnut UV Index

0 (Low)

Last Updated 10 minutes ago

Hourly Walnut UV Index

The hourly Walnut, CA UV Index forecast for Sunday, October 5th, 2025.

5 Day Hourly Walnut UV Index Forecast

Last Updated 11 hours ago

The UV index forecast for the next five days in Walnut, CA has no days reaching the extreme level and 4 days reaching the high or very high levels. The peak UV intensity in Walnut over the next five days will be 6.6 on Sunday, October 5th at 1:00 pm.

The UV index forecast for Sunday, October 5th in Walnut, CA is below.

Time UV Index Risk
11pm 0
Low

The UV index forecast for Monday, October 6th in Walnut, 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 2.6
Low
11am 4.2
Moderate
12pm 5.6
Moderate
1pm 6
High
2pm 5.4
Moderate
3pm 3.9
Moderate
4pm 2.2
Low
5pm 0.8
Low
6pm 0.2
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, October 7th in Walnut, 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 2.7
Low
11am 4.5
Moderate
12pm 5.9
Moderate
1pm 6.4
High
2pm 5.6
Moderate
3pm 4.1
Moderate
4pm 2.3
Low
5pm 0.8
Low
6pm 0.2
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, October 8th in Walnut, 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 1.2
Low
10am 2.8
Low
11am 4.6
Moderate
12pm 6.1
High
1pm 6.6
High
2pm 5.8
Moderate
3pm 4.2
Moderate
4pm 2.3
Low
5pm 0.8
Low
6pm 0.2
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, October 9th in Walnut, 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