Hourly Weather Forecast - O'Fallon, IL

12 AM
28°F
0%
7mph
SSW
Clear
Humidity
56%
Feels like
21°F
Dew Point
14°F
1 AM
28°F
0%
7mph
SSW
Clear
Humidity
59%
Feels like
20°F
Dew Point
15°F
2 AM
28°F
0%
6mph
SSW
Clear
Humidity
61%
Feels like
20°F
Dew Point
16°F
3 AM
28°F
0%
6mph
SSW
Clear
Humidity
63%
Feels like
21°F
Dew Point
17°F
4 AM
28°F
0%
6mph
SSW
Clear
Humidity
65%
Feels like
21°F
Dew Point
18°F
5 AM
28°F
0%
6mph
SSW
Clear
Humidity
66%
Feels like
21°F
Dew Point
18°F
6 AM
29°F
0%
6mph
SSW
Clear
Humidity
65%
Feels like
22°F
Dew Point
18°F
7 AM
30°F
0%
7mph
SSW
Clear
Humidity
64%
Feels like
23°F
Dew Point
19°F
7:10 AM
8 AM
33°F
0%
7mph
S
Sunny
Humidity
62%
Feels like
26°F
Dew Point
21°F
9 AM
36°F
0%
8mph
S
Sunny
Humidity
58%
Feels like
30°F
Dew Point
23°F
10 AM
40°F
0%
9mph
SSW
Sunny
Humidity
56%
Feels like
34°F
Dew Point
25°F
11 AM
43°F
0%
10mph
SSW
Sunny
Humidity
54%
Feels like
37°F
Dew Point
28°F
12 PM
46°F
0%
11mph
SSW
Sunny
Humidity
53%
Feels like
40°F
Dew Point
29°F
1 PM
47°F
0%
11mph
SSW
Sunny
Humidity
53%
Feels like
42°F
Dew Point
31°F
2 PM
46°F
0%
12mph
S
Sunny
Humidity
57%
Feels like
41°F
Dew Point
32°F
3 PM
45°F
0%
12mph
S
Sunny
Humidity
60%
Feels like
39°F
Dew Point
32°F
4 PM
43°F
0%
11mph
S
Partly Cloudy
Humidity
66%
Feels like
37°F
Dew Point
33°F
4:39 PM
5 PM
42°F
0%
11mph
S
Mostly Cloudy
Humidity
70%
Feels like
35°F
Dew Point
33°F
6 PM
40°F
0%
11mph
S
Cloudy
Humidity
73%
Feels like
34°F
Dew Point
32°F
7 PM
39°F
0%
10mph
SSW
Mostly Cloudy
Humidity
77%
Feels like
33°F
Dew Point
33°F
8 PM
39°F
0%
10mph
SSW
Mostly Clear
Humidity
79%
Feels like
32°F
Dew Point
33°F
9 PM
38°F
0%
10mph
SSW
Mostly Clear
Humidity
81%
Feels like
32°F
Dew Point
33°F
10 PM
38°F
0%
9mph
SSW
Mostly Clear
Humidity
82%
Feels like
32°F
Dew Point
33°F
11 PM
38°F
0%
9mph
SSW
Partly Cloudy
Humidity
87%
Feels like
32°F
Dew Point
35°F

Wind chill temperatures Monday A.M.

Cold Weather Chills the Nation Down to the Gulf

Extreme cold paired with their wind chill values will shiver much of the nation.

Snowfall forecast through Monday evening.

Mid-Atlantic, Great Lakes Snow Piles Up

Monday's Weather Outlook

Monday's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

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

Cold Air Damming - Cause And Effects

loading ad...

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide