UV Index for Grinnell, IA

Current Grinnell UV Index

4.4 (Moderate)

Last Updated 36 minutes ago

Hourly Grinnell UV Index

The hourly Grinnell, IA UV Index forecast for Wednesday, September 17th, 2025.

5 Day Hourly Grinnell UV Index Forecast

Last Updated 2 hours ago

The UV index forecast for the next five days in Grinnell, IA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Grinnell over the next five days will be 5.7 on Saturday, September 20th at 1:00 pm.

The UV index forecast for Wednesday, September 17th in Grinnell, IA is below.

Time UV Index Risk
4pm 2.9
Low
5pm 1.3
Low
6pm 0.4
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, September 18th in Grinnell, IA 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 0.1
Low
9am 0.6
Low
10am 1.9
Low
11am 3
Moderate
12pm 4
Moderate
1pm 2.8
Low
2pm 2.8
Low
3pm 2.2
Low
4pm 1
Low
5pm 0.8
Low
6pm 0.4
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 Grinnell, IA 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 0.6
Low
10am 1.6
Low
11am 3.2
Moderate
12pm 4.6
Moderate
1pm 4.7
Moderate
2pm 4.2
Moderate
3pm 3
Moderate
4pm 2
Low
5pm 0.6
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 Grinnell, IA 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 2.3
Low
11am 4
Moderate
12pm 5.5
Moderate
1pm 5.7
Moderate
2pm 5.6
Moderate
3pm 4.4
Moderate
4pm 3
Moderate
5pm 1.4
Low
6pm 0.4
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 Grinnell, IA 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