Hourly Weather Forecast - O'Fallon, IL

3 PM
49°F
0%
14mph
S
Partly Cloudy
Humidity
57%
Feels like
44°F
Dew Point
35°F
4 PM
48°F
0%
14mph
S
Mostly Cloudy
Humidity
61%
Feels like
42°F
Dew Point
35°F
4:38 PM
5 PM
46°F
0%
15mph
S
Mostly Cloudy
Humidity
65%
Feels like
40°F
Dew Point
35°F
6 PM
45°F
0%
16mph
S
Mostly Cloudy
Humidity
66%
Feels like
38°F
Dew Point
35°F
7 PM
45°F
0%
17mph
SSW
Mostly Cloudy
Humidity
66%
Feels like
38°F
Dew Point
34°F
8 PM
45°F
0%
17mph
SSW
Mostly Cloudy
Humidity
66%
Feels like
38°F
Dew Point
34°F
9 PM
45°F
0%
17mph
SSW
Mostly Cloudy
Humidity
66%
Feels like
38°F
Dew Point
34°F
10 PM
45°F
0%
16mph
SW
Mostly Cloudy
Humidity
65%
Feels like
38°F
Dew Point
34°F
11 PM
46°F
10%
15mph
SW
Mostly Cloudy
Humidity
64%
Feels like
39°F
Dew Point
34°F

Snow and ice forecast through Thursday A.M.

Snow Barrels Across the Northern U.S.

Low pressure will produce a swath of snow from Minnesota to Maine into Thursday.

Rainfall Forecast for Northwest through Thursday

Heavy Rain, Flooding Soaks The Northwest

Wednesday's Weather Outlook

Wednesday's Weather Outlook

Weekly Drought Map for December 4, 2025

Active Week of Weather Leads to Mixed Drought Results

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

People skating on a frozen pond on a clear day. (Image by Q K from Pixabay)

Safety Tips For Icy Surfaces

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide