UV Index for Rialto, CA

Current Rialto UV Index

0.5 (Low)

Last Updated 50 minutes ago

Hourly Rialto UV Index

The hourly Rialto, CA UV Index forecast for Friday, July 11th, 2025.

5 Day Hourly Rialto UV Index Forecast

Last Updated 20 hours ago

The UV index forecast for the next five days in Rialto, CA has 3 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 11.7 on Saturday, July 12th at 1:00 pm.

The UV index forecast for Friday, July 11th in Rialto, CA is below.

Time UV Index Risk
8am 1.6
Low
9am 3.7
Moderate
10am 6.4
High
11am 9.2
Very High
12pm 11.1
Extreme
1pm 11.6
Extreme
2pm 10.7
Very High
3pm 8.3
Very High
4pm 5.5
Moderate
5pm 2.9
Low
6pm 1.2
Low
7pm 0.3
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, July 12th 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 0.5
Low
8am 1.6
Low
9am 3.8
Moderate
10am 6.5
High
11am 9.2
Very High
12pm 11.1
Extreme
1pm 11.7
Extreme
2pm 10.7
Very High
3pm 8.4
Very High
4pm 5.6
Moderate
5pm 3
Moderate
6pm 1.2
Low
7pm 0.3
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, July 13th 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 0.5
Low
8am 1.6
Low
9am 3.7
Moderate
10am 6.4
High
11am 9.1
Very High
12pm 10.9
Very High
1pm 11.4
Extreme
2pm 10.4
Very High
3pm 8
Very High
4pm 5.3
Moderate
5pm 2.8
Low
6pm 1.1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, July 14th 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