UV Index for Alton, IL

Current Alton UV Index

0.9 (Low)

Last Updated 18 minutes ago

Hourly Alton UV Index

The hourly Alton, IL UV Index forecast for Wednesday, October 15th, 2025.

5 Day Hourly Alton UV Index Forecast

Last Updated 21 hours ago

The UV index forecast for the next five days in Alton, IL has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Alton over the next five days will be 5.3 on Wednesday, October 15th at 1:00 pm.

The UV index forecast for Wednesday, October 15th in Alton, IL is below.

Time UV Index Risk
11am 3.2
Moderate
12pm 4.5
Moderate
1pm 5.3
Moderate
2pm 4.8
Moderate
3pm 3.5
Moderate
4pm 2
Low
5pm 0.8
Low
6pm 0.2
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, October 16th 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 0.7
Low
10am 1.8
Low
11am 3.3
Moderate
12pm 4.6
Moderate
1pm 5.2
Moderate
2pm 4.7
Moderate
3pm 3.4
Moderate
4pm 1.9
Low
5pm 0.7
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 Friday, October 17th 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 0.5
Low
10am 0.9
Low
11am 2.4
Low
12pm 2.5
Low
1pm 2.6
Low
2pm 3.7
Moderate
3pm 3.1
Moderate
4pm 1.7
Low
5pm 0.6
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 Saturday, October 18th 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