Hourly Weather Forecast - O'Fallon, MO

12 AM
34°F
0%
6mph
NNW
Partly Cloudy
Humidity
72%
Feels like
29°F
Dew Point
26°F
1 AM
33°F
0%
6mph
NNW
Partly Cloudy
Humidity
74%
Feels like
27°F
Dew Point
25°F
2 AM
31°F
0%
5mph
NNW
Partly Cloudy
Humidity
76%
Feels like
26°F
Dew Point
25°F
3 AM
30°F
0%
5mph
NNW
Partly Cloudy
Humidity
79%
Feels like
25°F
Dew Point
25°F
4 AM
29°F
0%
4mph
NNW
Partly Cloudy
Humidity
82%
Feels like
24°F
Dew Point
24°F
5 AM
28°F
0%
4mph
NNW
Partly Cloudy
Humidity
85%
Feels like
23°F
Dew Point
24°F
6 AM
28°F
0%
4mph
NNW
Partly Cloudy
Humidity
86%
Feels like
23°F
Dew Point
24°F
7 AM
28°F
0%
4mph
N
Mostly Clear
Humidity
83%
Feels like
24°F
Dew Point
24°F
7:17 AM
8 AM
30°F
0%
4mph
N
Mostly Sunny
Humidity
76%
Feels like
27°F
Dew Point
24°F
9 AM
33°F
0%
3mph
N
Sunny
Humidity
68%
Feels like
29°F
Dew Point
23°F
10 AM
35°F
10%
3mph
N
Sunny
Humidity
60%
Feels like
32°F
Dew Point
23°F
11 AM
38°F
10%
4mph
NNE
Sunny
Humidity
53%
Feels like
35°F
Dew Point
22°F
12 PM
40°F
10%
4mph
NE
Sunny
Humidity
48%
Feels like
37°F
Dew Point
22°F
1 PM
42°F
0%
4mph
NE
Sunny
Humidity
44%
Feels like
40°F
Dew Point
22°F
2 PM
43°F
10%
5mph
ENE
Sunny
Humidity
43%
Feels like
40°F
Dew Point
22°F
3 PM
42°F
10%
5mph
E
Sunny
Humidity
44%
Feels like
39°F
Dew Point
22°F
4 PM
41°F
10%
5mph
E
Mostly Sunny
Humidity
47%
Feels like
37°F
Dew Point
22°F
4:44 PM
5 PM
38°F
10%
4mph
E
Mostly Clear
Humidity
51%
Feels like
35°F
Dew Point
22°F
6 PM
37°F
10%
4mph
ESE
Mostly Clear
Humidity
58%
Feels like
34°F
Dew Point
23°F
7 PM
36°F
10%
4mph
ESE
Partly Cloudy
Humidity
61%
Feels like
32°F
Dew Point
24°F
8 PM
35°F
10%
4mph
ESE
Partly Cloudy
Humidity
62%
Feels like
32°F
Dew Point
24°F
9 PM
35°F
10%
5mph
ESE
Partly Cloudy
Humidity
63%
Feels like
31°F
Dew Point
24°F
10 PM
35°F
20%
5mph
ESE
Partly Cloudy
Humidity
64%
Feels like
31°F
Dew Point
24°F
11 PM
35°F
10%
5mph
SE
Mostly Cloudy
Humidity
65%
Feels like
31°F
Dew Point
25°F

Rainfall and Snowfall Totals Through Thursday

Pineapple Express Slams Northwestern U.S.

The atmospheric river this week will keep buffeting the Pacific Northwest with heavy rain, snow, and high winds.

Wednesday's Weather Outlook

Today'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 person standing in a snowy forest with their back to the camera. They are bundled up in a white hat and a brown jacket. (Image by StockSnap from Pixabay)

Common Cold Weather Illnesses

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

Cold Air Damming - Cause And Effects

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