UV Index for Rialto, CA

Current Rialto UV Index

9.4 (Very High)

Last Updated 20 minutes ago

Hourly Rialto UV Index

The hourly Rialto, CA UV Index forecast for Tuesday, July 15th, 2025.

5 Day Hourly Rialto UV Index Forecast

Last Updated 3 hours ago

The UV index forecast for the next five days in Rialto, CA has 1 day reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Rialto over the next five days will be 11 on Friday, July 18th at 1:00 pm.

The UV index forecast for Tuesday, July 15th in Rialto, CA is below.

Time UV Index Risk
3pm 7.4
High
4pm 4.9
Moderate
5pm 2.6
Low
6pm 1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, July 16th 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 0.4
Low
8am 1.4
Low
9am 3.2
Moderate
10am 5.7
Moderate
11am 8.2
Very High
12pm 10
Very High
1pm 10.5
Very High
2pm 9.5
Very High
3pm 7.5
High
4pm 4.9
Moderate
5pm 2.5
Low
6pm 1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, July 17th 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 0.4
Low
8am 1.4
Low
9am 3.4
Moderate
10am 5.9
Moderate
11am 8.5
Very High
12pm 10.3
Very High
1pm 10.8
Very High
2pm 9.8
Very High
3pm 7.7
High
4pm 5
Moderate
5pm 2.6
Low
6pm 1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, July 18th 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 0.4
Low
8am 1.5
Low
9am 3.4
Moderate
10am 6
High
11am 8.6
Very High
12pm 10.4
Very High
1pm 11
Extreme
2pm 10
Very High
3pm 7.8
High
4pm 5.1
Moderate
5pm 2.7
Low
6pm 1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, July 19th 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