UV Index for Williams Bay, WI

Current Williams Bay UV Index

0.4 (Low)

Last Updated 45 minutes ago

Hourly Williams Bay UV Index

The hourly Williams Bay, WI UV Index forecast for Thursday, September 18th, 2025.

5 Day Hourly Williams Bay UV Index Forecast

Last Updated 19 hours ago

The UV index forecast for the next five days in Williams Bay, WI has no days reaching the extreme level and 1 day reaching the high or very high levels. The peak UV intensity in Williams Bay over the next five days will be 6 on Thursday, September 18th at 1:00 pm.

The UV index forecast for Thursday, September 18th in Williams Bay, WI is below.

Time UV Index Risk
9am 1.2
Low
10am 2.7
Low
11am 4.3
Moderate
12pm 5.6
Moderate
1pm 6
High
2pm 5.4
Moderate
3pm 4.1
Moderate
4pm 2.4
Low
5pm 1.1
Low
6pm 0.3
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, September 19th in Williams Bay, WI 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 0.3
Low
9am 1.1
Low
10am 2.5
Low
11am 4.1
Moderate
12pm 5.2
Moderate
1pm 5.2
Moderate
2pm 4.4
Moderate
3pm 3.7
Moderate
4pm 1.3
Low
5pm 0.4
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, September 20th in Williams Bay, WI 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 0.3
Low
9am 1.1
Low
10am 2.4
Low
11am 3.7
Moderate
12pm 4.8
Moderate
1pm 5.6
Moderate
2pm 5.1
Moderate
3pm 3.8
Moderate
4pm 2.4
Low
5pm 1.1
Low
6pm 0.3
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, September 21st in Williams Bay, WI 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