Hourly Weather Forecast - O'Fallon, IL

12 AM
30°F
0%
10mph
S
Partly Cloudy
Humidity
67%
Feels like
22°F
Dew Point
21°F
1 AM
30°F
0%
10mph
S
Partly Cloudy
Humidity
68%
Feels like
22°F
Dew Point
21°F
2 AM
31°F
0%
10mph
S
Partly Cloudy
Humidity
68%
Feels like
22°F
Dew Point
21°F
3 AM
31°F
0%
11mph
S
Partly Cloudy
Humidity
68%
Feels like
22°F
Dew Point
22°F
4 AM
32°F
10%
11mph
S
Partly Cloudy
Humidity
68%
Feels like
23°F
Dew Point
23°F
5 AM
32°F
10%
11mph
S
Partly Cloudy
Humidity
69%
Feels like
23°F
Dew Point
23°F
6 AM
33°F
0%
11mph
S
Partly Cloudy
Humidity
69%
Feels like
24°F
Dew Point
24°F
7 AM
34°F
0%
12mph
S
Partly Cloudy
Humidity
68%
Feels like
26°F
Dew Point
25°F
7:13 AM
8 AM
38°F
0%
13mph
S
Mostly Sunny
Humidity
66%
Feels like
30°F
Dew Point
27°F
9 AM
41°F
10%
13mph
S
Mostly Sunny
Humidity
62%
Feels like
34°F
Dew Point
29°F
10 AM
45°F
10%
14mph
S
Mostly Sunny
Humidity
58%
Feels like
38°F
Dew Point
31°F
11 AM
48°F
10%
15mph
S
Mostly Sunny
Humidity
56%
Feels like
42°F
Dew Point
33°F
12 PM
51°F
10%
15mph
S
Sunny
Humidity
54%
Feels like
51°F
Dew Point
35°F
1 PM
53°F
10%
15mph
S
Sunny
Humidity
53%
Feels like
53°F
Dew Point
36°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

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