UV Index for Alton, IL

Current Alton UV Index

0 (Low)

Last Updated 58 minutes ago

Hourly Alton UV Index

The hourly Alton, IL UV Index forecast for Friday, May 2nd, 2025.

5 Day Hourly Alton UV Index Forecast

Last Updated 16 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 7.9 on Sunday, May 4th at 1:00 pm.

The UV index forecast for Friday, May 2nd in Alton, IL is below.

Time UV Index Risk
6am 0
Low
7am 0.2
Low
8am 0.9
Low
9am 2.2
Low
10am 3.4
Moderate
11am 4
Moderate
12pm 4.4
Moderate
1pm 7.4
High
2pm 6.9
High
3pm 5.6
Moderate
4pm 3.9
Moderate
5pm 2
Low
6pm 0.8
Low
7pm 0.1
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, May 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 0.2
Low
8am 0.8
Low
9am 2
Low
10am 3.6
Moderate
11am 5.4
Moderate
12pm 6.9
High
1pm 7.4
High
2pm 7
High
3pm 5.7
Moderate
4pm 3.9
Moderate
5pm 2.2
Low
6pm 0.9
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, May 4th 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 0.2
Low
8am 0.8
Low
9am 2.1
Low
10am 3.9
Moderate
11am 5.8
Moderate
12pm 7.3
High
1pm 7.9
High
2pm 7.4
High
3pm 6
High
4pm 4.1
Moderate
5pm 2.3
Low
6pm 0.9
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, May 5th 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 0.2
Low