Hourly Weather Forecast - O'Fallon, IL

9 AM
43°F
0%
11mph
S
Partly Cloudy
Humidity
59%
Feels like
37°F
Dew Point
29°F
10 AM
46°F
0%
11mph
SSW
Partly Cloudy
Humidity
54%
Feels like
41°F
Dew Point
31°F
11 AM
49°F
0%
11mph
SSW
Partly Cloudy
Humidity
50%
Feels like
45°F
Dew Point
31°F
12 PM
52°F
0%
10mph
SW
Mostly Sunny
Humidity
47%
Feels like
52°F
Dew Point
32°F
1 PM
53°F
0%
9mph
SW
Mostly Sunny
Humidity
46%
Feels like
53°F
Dew Point
33°F
2 PM
54°F
0%
8mph
W
Mostly Sunny
Humidity
46%
Feels like
54°F
Dew Point
33°F
3 PM
52°F
0%
7mph
WNW
Partly Cloudy
Humidity
48%
Feels like
52°F
Dew Point
33°F
4 PM
49°F
0%
6mph
NW
Mostly Sunny
Humidity
55%
Feels like
46°F
Dew Point
33°F
4:41 PM
5 PM
45°F
0%
7mph
NNW
Mostly Clear
Humidity
62%
Feels like
41°F
Dew Point
33°F
6 PM
42°F
0%
8mph
NNW
Mostly Clear
Humidity
66%
Feels like
38°F
Dew Point
32°F
7 PM
41°F
0%
8mph
NNW
Mostly Clear
Humidity
69%
Feels like
35°F
Dew Point
31°F
8 PM
39°F
0%
9mph
NNW
Partly Cloudy
Humidity
72%
Feels like
33°F
Dew Point
31°F
9 PM
37°F
0%
9mph
NNW
Partly Cloudy
Humidity
73%
Feels like
31°F
Dew Point
29°F
10 PM
37°F
0%
9mph
NNW
Partly Cloudy
Humidity
72%
Feels like
30°F
Dew Point
28°F
11 PM
35°F
0%
8mph
NNW
Partly Cloudy
Humidity
71%
Feels like
29°F
Dew Point
27°F

Rain And Snow Totals Through Monday

Atmospheric River Takes Aim For Northern California

The plume of abundant moisture impacting the Northwest the last several days will focus more on Northern California later today into Monday bringing heavy rainfall and mountain snow.

NOAA, NCDC

White Christmas? What Are The Odds

Weekend Weather Outlook

Weekend Weather Outlook

Cold weather

During Extreme Cold: Watch for Frostbite!

Flu Update Valid For Week Ending December 13, 2025

Weekly Flu Update: Flu Spreading Hard Across U.S.

Watch vs. Warning

Flash Flood Watch and Warning Defined

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