Hourly Weather Forecast - O'Fallon, MO

12 AM
49°F
10%
16mph
WSW
Mostly Cloudy
Humidity
60%
Feels like
43°F
Dew Point
36°F
1 AM
49°F
10%
16mph
WSW
Mostly Cloudy
Humidity
63%
Feels like
42°F
Dew Point
36°F
2 AM
48°F
10%
17mph
W
Cloudy
Humidity
66%
Feels like
42°F
Dew Point
37°F
3 AM
47°F
10%
17mph
W
Mostly Cloudy
Humidity
68%
Feels like
40°F
Dew Point
37°F
4 AM
46°F
0%
18mph
W
Partly Cloudy
Humidity
69%
Feels like
39°F
Dew Point
37°F
5 AM
45°F
0%
19mph
WNW
Partly Cloudy
Humidity
69%
Feels like
38°F
Dew Point
36°F
6 AM
44°F
0%
20mph
WNW
Partly Cloudy
Humidity
67%
Feels like
36°F
Dew Point
34°F
7 AM
43°F
0%
20mph
WNW
Windy
Humidity
65%
Feels like
34°F
Dew Point
32°F
7:10 AM
8 AM
42°F
0%
20mph
WNW
Windy
Humidity
64%
Feels like
33°F
Dew Point
31°F
9 AM
41°F
0%
22mph
WNW
Windy
Humidity
62%
Feels like
31°F
Dew Point
29°F
10 AM
40°F
10%
22mph
NW
Windy
Humidity
62%
Feels like
30°F
Dew Point
28°F
11 AM
39°F
10%
21mph
NW
Windy
Humidity
62%
Feels like
29°F
Dew Point
27°F
12 PM
38°F
10%
20mph
NW
Windy
Humidity
62%
Feels like
28°F
Dew Point
26°F
1 PM
38°F
0%
19mph
NW
Partly Cloudy
Humidity
61%
Feels like
28°F
Dew Point
26°F
2 PM
37°F
0%
17mph
NW
Partly Cloudy
Humidity
62%
Feels like
28°F
Dew Point
26°F
3 PM
37°F
0%
16mph
WNW
Partly Cloudy
Humidity
63%
Feels like
28°F
Dew Point
25°F
4 PM
36°F
0%
14mph
WNW
Partly Cloudy
Humidity
64%
Feels like
27°F
Dew Point
25°F
4:41 PM
5 PM
35°F
0%
11mph
NW
Mostly Cloudy
Humidity
66%
Feels like
27°F
Dew Point
25°F
6 PM
35°F
0%
10mph
NW
Mostly Cloudy
Humidity
67%
Feels like
27°F
Dew Point
25°F
7 PM
34°F
0%
9mph
NW
Cloudy
Humidity
68%
Feels like
27°F
Dew Point
25°F
8 PM
34°F
0%
9mph
NW
Cloudy
Humidity
68%
Feels like
27°F
Dew Point
25°F
9 PM
33°F
0%
9mph
NW
Cloudy
Humidity
70%
Feels like
26°F
Dew Point
25°F
10 PM
33°F
0%
8mph
NW
Cloudy
Humidity
71%
Feels like
25°F
Dew Point
24°F
11 PM
32°F
0%
8mph
NW
Cloudy
Humidity
71%
Feels like
25°F
Dew Point
23°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