UV Index for Alton, IL

Current Alton UV Index

0 (Low)

Last Updated 17 minutes ago

Hourly Alton UV Index

The hourly Alton, IL UV Index forecast for Sunday, August 31st, 2025.

5 Day Hourly Alton UV Index Forecast

Last Updated 13 hours ago

The UV index forecast for the next five days in Alton, IL has no days reaching the extreme level and 1 day reaching the high or very high levels. The peak UV intensity in Alton over the next five days will be 6.8 on Tuesday, September 2nd at 2:00 pm.

The UV index forecast for Sunday, August 31st in Alton, IL is below.

Time UV Index Risk
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.4
Low
9am 1.3
Low
10am 3.1
Moderate
11am 5.4
Moderate
12pm 5.7
Moderate
1pm 5.6
Moderate
2pm 5.3
Moderate
3pm 5.2
Moderate
4pm 2.6
Low
5pm 1.6
Low
6pm 0.6
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, September 1st 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
Low
8am 0
Low
9am 0.2
Low
10am 0.4
Low
11am 2.4
Low
12pm 4.6
Moderate
1pm 1.9
Low
2pm 0.7
Low
3pm 0.4
Low
4pm 0.4
Low
5pm 0.2
Low
6pm 0.1
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, September 2nd 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
Low
8am 0.2
Low
9am 0.9
Low
10am 1.2
Low
11am 1.9
Low
12pm 3.8
Moderate
1pm 6.3
High
2pm 6.8
High
3pm 4.7
Moderate
4pm 2.7
Low
5pm 1.7
Low
6pm 0.6
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, September 3rd 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
Low