UV Index for Rialto, CA

Current Rialto UV Index

0 (Low)

Last Updated 58 minutes ago

Hourly Rialto UV Index

The hourly Rialto, CA UV Index forecast for Tuesday, December 23rd, 2025.

5 Day Hourly Rialto UV Index Forecast

Last Updated 11 hours ago

The UV index forecast for the next five days in Rialto, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Rialto over the next five days will be 2.8 on Thursday, December 25th at 12:00 pm.

The UV index forecast for Tuesday, December 23rd in Rialto, CA is below.

Time UV Index Risk
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, December 24th in Rialto, 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
Low
9am 0.1
Low
10am 0.2
Low
11am 0.1
Low
12pm 0.1
Low
1pm 0.1
Low
2pm 0.1
Low
3pm 0
Low
4pm 0
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 Thursday, December 25th in Rialto, 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
Low
10am 1.7
Low
11am 2.5
Low
12pm 2.8
Low
1pm 2.4
Low
2pm 1.6
Low
3pm 0.6
Low
4pm 0.1
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 26th in Rialto, 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 0.2
Low
9am 0.8
Low
10am 1.6
Low
11am 1.6
Low
12pm 1.9
Low
1pm 1.4
Low
2pm 1
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 Saturday, December 27th in Rialto, CA is below.

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