Ontario, Wisconsin, United States UV Index Forecast

Find the UV Index forecast for today, tomorrow and the next 15 days for Ontario, Wisconsin, 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
11:00 pm

Low0

UV INDEX

Hourly UV Index Forecast for Today
July 20, 2025

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

As of 11:00 pm today in Ontario, Wisconsin, United States, the UV Index is currently at a Low level of 0.

Summary of Hourly UV Index Forecast for Today and Tomorrow in Ontario, Wisconsin, United States.

Today

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

Tomorrow

Time Range UV Index Risk
6 am 0
Low
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 9
Very High
3 pm 8
Very High
4 pm 7
High
5 pm 6
High
6 pm 4
Moderate
7 pm 3
Moderate

Daily Ontario UV Index Forecast for the next 15 days:

7
20 Jul
9
21 Jul
6
22 Jul
8
23 Jul
7
24 Jul
8
25 Jul
8
26 Jul
8
27 Jul
5
28 Jul
8
29 Jul
8
30 Jul
7
31 Jul
8
1 Aug
8
2 Aug
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

UV Index in Nearby Cities