Diamond Bar, California, United States UV Index Forecast

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

NOW
9:20 am

Moderate5

UV INDEX

Hourly UV Index Forecast for Today
September 12, 2025

0
7 am
1
8 am
1
9 am
5
10 am
7
11 am
9
12 pm
9
1 pm
8
2 pm
8
3 pm
6
4 pm
4
5 pm
2
6 pm
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

As of 9:20 am today in Diamond Bar, California, United States, the UV Index is currently at a Moderate level of 5.

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

Today

Time Range UV Index Risk
7 am 0
Low
8 am 1
Low
9 am 1
Low
10 am 5
Moderate
11 am 7
High
12 pm 9
Very High
1 pm 9
Very High
2 pm 8
Very High
3 pm 8
Very High
4 pm 6
High
5 pm 4
Moderate
6 pm 2
Low

Tomorrow

Time Range UV Index Risk
7 am 0
Low
8 am 1
Low
9 am 2
Low
10 am 4
Moderate
11 am 6
High
12 pm 9
Very High
1 pm 9
Very High
2 pm 9
Very High
3 pm 8
Very High
4 pm 6
High
5 pm 5
Moderate
6 pm 3
Moderate

Daily Diamond Bar UV Index Forecast for the next 15 days:

9
12 Sep
9
13 Sep
9
14 Sep
9
15 Sep
9
16 Sep
9
17 Sep
8
18 Sep
5
19 Sep
6
20 Sep
8
21 Sep
5
22 Sep
8
23 Sep
8
24 Sep
8
25 Sep
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

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