UV Index for Grass Valley, CA

Current Grass Valley UV Index

1.3 (Low)

Last Updated 22 minutes ago

Hourly Grass Valley UV Index

The hourly Grass Valley, CA UV Index forecast for Thursday, December 4th, 2025.

5 Day Hourly Grass Valley UV Index Forecast

Last Updated 4 hours ago

The UV index forecast for the next five days in Grass Valley, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Grass Valley over the next five days will be 2.2 on Friday, December 5th at 12:00 pm.

The UV index forecast for Thursday, December 4th in Grass Valley, CA is below.

Time UV Index Risk
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 Friday, December 5th in Grass Valley, 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 0.1
Low
9am 0.6
Low
10am 1.2
Low
11am 1.9
Low
12pm 2.2
Low
1pm 2
Low
2pm 1.4
Low
3pm 0.7
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 6th in Grass Valley, 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 0.1
Low
9am 0.5
Low
10am 1.1
Low
11am 1.7
Low
12pm 2
Low
1pm 1.6
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 Sunday, December 7th in Grass Valley, 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 0.1
Low
9am 0.4
Low
10am 0.9
Low
11am 1.3
Low
12pm 1.6
Low
1pm 1.5
Low
2pm 1
Low
3pm 0.5
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 8th in Grass Valley, CA is below.

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