UV Index for Rialto, CA

Current Rialto UV Index

3.1 (Moderate)

Last Updated 50 minutes ago

Hourly Rialto UV Index

The hourly Rialto, CA UV Index forecast for Wednesday, October 22nd, 2025.

5 Day Hourly Rialto UV Index Forecast

Last Updated 4 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 5.4 on Friday, October 24th at 1:00 pm.

The UV index forecast for Wednesday, October 22nd in Rialto, CA is below.

Time UV Index Risk
4pm 1.6
Low
5pm 0.5
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, October 23rd 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 2.1
Low
11am 3.6
Moderate
12pm 4.8
Moderate
1pm 5.2
Moderate
2pm 4.4
Moderate
3pm 3.1
Moderate
4pm 1.6
Low
5pm 0.5
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, October 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 0.2
Low
9am 0.8
Low
10am 2.2
Low
11am 3.8
Moderate
12pm 5
Moderate
1pm 5.4
Moderate
2pm 4.7
Moderate
3pm 3.3
Moderate
4pm 1.7
Low
5pm 0.6
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, October 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 0.2
Low
9am 0.8
Low
10am 2.1
Low
11am 3.6
Moderate
12pm 4.8
Moderate
1pm 5.2
Moderate
2pm 4.5
Moderate
3pm 3.1
Moderate
4pm 1.6
Low
5pm 0.5
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, October 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