UV Index for Alton, IL

Current Alton UV Index

0 (Low)

Last Updated 15 minutes ago

Hourly Alton UV Index

The hourly Alton, IL UV Index forecast for Sunday, July 6th, 2025.

5 Day Hourly Alton UV Index Forecast

Last Updated 12 hours ago

The UV index forecast for the next five days in Alton, IL has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Alton over the next five days will be 10.4 on Tuesday, July 8th at 1:00 pm.

The UV index forecast for Sunday, July 6th in Alton, IL is below.

Time UV Index Risk
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0.4
Low
8am 1.1
Low
9am 2.4
Low
10am 5.2
Moderate
11am 8
Very High
12pm 9.1
Very High
1pm 8.6
Very High
2pm 5.6
Moderate
3pm 3.6
Moderate
4pm 1.9
Low
5pm 0.2
Low
6pm 0.3
Low
7pm 0.3
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, July 7th in Alton, IL 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 1.3
Low
9am 2.8
Low
10am 5.2
Moderate
11am 7.8
High
12pm 9.7
Very High
1pm 9.9
Very High
2pm 9.3
Very High
3pm 8
Very High
4pm 5.6
Moderate
5pm 3.1
Moderate
6pm 1.4
Low
7pm 0.4
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, July 8th in Alton, IL 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 3.1
Moderate
10am 5.4
Moderate
11am 7.8
High
12pm 9.6
Very High
1pm 10.4
Very High
2pm 9.6
Very High
3pm 7.8
High
4pm 5.6
Moderate
5pm 3.2
Moderate
6pm 1.4
Low
7pm 0.4
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, July 9th in Alton, IL 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