Rialto, California, United States UV Index Forecast

Find the UV Index forecast for today, tomorrow and the next 15 days for Rialto, California, United States, The Ultraviolet Index forecast, which measures the radiation from the sun that reaches the Earth's surface is updated hourly.

Current UV Index
5:20 am

Low0

UV INDEX

Hourly UV Index Forecast for Today
August 4, 2025

1
7 am
3
8 am
5
9 am
7
10 am
8
11 am
10
12 pm
10
1 pm
10
2 pm
9
3 pm
8
4 pm
6
5 pm
3
6 pm
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

As of 5:20 am today in Rialto, California, United States, the UV Index is currently at a Low level of 0.

Summary of Hourly UV Index Forecast for Today and Tomorrow in Rialto, California, United States.

Today

Time Range UV Index Risk
7 am 1
Low
8 am 3
Moderate
9 am 5
Moderate
10 am 7
High
11 am 8
Very High
12 pm 10
Very High
1 pm 10
Very High
2 pm 10
Very High
3 pm 9
Very High
4 pm 8
Very High
5 pm 6
High
6 pm 3
Moderate

Tomorrow

Time Range UV Index Risk
7 am 1
Low
8 am 3
Moderate
9 am 5
Moderate
10 am 6
High
11 am 8
Very High
12 pm 8
Very High
1 pm 9
Very High
2 pm 10
Very High
3 pm 9
Very High
4 pm 7
High
5 pm 6
High
6 pm 4
Moderate

Daily Rialto UV Index Forecast for the next 15 days:

10
4 Aug
10
5 Aug
10
6 Aug
10
7 Aug
10
8 Aug
10
9 Aug
9
10 Aug
10
11 Aug
10
12 Aug
10
13 Aug
10
14 Aug
10
15 Aug
10
16 Aug
9
17 Aug
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

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