Hourly Weather Forecast - O'Fallon, MO

12 AM
44°F
10%
5mph
S
Partly Cloudy
Humidity
89%
Feels like
41°F
Dew Point
41°F
1 AM
44°F
10%
5mph
S
Partly Cloudy
Humidity
91%
Feels like
41°F
Dew Point
41°F
2 AM
44°F
10%
5mph
S
Partly Cloudy
Humidity
92%
Feels like
41°F
Dew Point
41°F
3 AM
44°F
10%
5mph
S
Partly Cloudy
Humidity
93%
Feels like
41°F
Dew Point
42°F
4 AM
44°F
10%
5mph
SSW
Partly Cloudy
Humidity
92%
Feels like
41°F
Dew Point
42°F
5 AM
44°F
10%
5mph
SSW
Partly Cloudy
Humidity
93%
Feels like
42°F
Dew Point
42°F
6 AM
45°F
10%
5mph
SSW
Partly Cloudy
Humidity
93%
Feels like
43°F
Dew Point
43°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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