OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CST UTC Last station update CST

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Wednesday, 24-Dec-2025 05:00 am

Today Mostly Cloudy	Tonight Partly Cloudy	Thursday Mostly Cloudy	Thursday night Fog late	Friday Sunny	Friday night Fog late	Saturday Fog	Saturday night Fog
<.1 in.		<.1 in.
High: 63°	Low: 50°	High: 59°	Low: 51°	High: 71°	Low: 43°	High: 59°	Low: 51°

ESE 5 mph	SSW→WSW 4 mph	NW→SE calm	SE→SSW 5 mph	WSW 7-22 mph	NW→ESE calm	ESE 4 mph	SSW 5 mph

Today	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain. Unusually mild. High 63°. Wind east-southeast around 5 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Unusually mild. Low 50°. Wind south-southwest around 4 mph in the evening, becoming west-southwest after midnight.
Thursday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Unusually mild. High 59°. Wind northwest near calm in the morning, becoming southeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Unusually mild. Low 51°. Wind southeast around 5 mph in the evening, becoming south-southwest after midnight.
Friday	Sunny. Exceptionally warm. High 71°. Wind west-southwest around 7 mph, gusting to 22 mph.
Friday night	Clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Relatively mild. Low 43°. Wind northwest near calm in the evening, becoming east-southeast after midnight.
Saturday	Partly cloudy. Patchy light fog. Unusually mild. High 59°. Wind east-southeast around 4 mph.
Saturday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening. Unusually mild. Low 51°. Wind south-southwest around 5 mph.
Sunday	Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog. Rain likely. Relatively mild. High 57°, but temperatures falling in the afternoon. Wind west-southwest around 4 mph, gusting to 18 mph, in the morning, becoming northwest around 11 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Sunday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy. Low 25°. Wind chill ranging from 18 to 38. Wind northwest around 12 mph, gusting to 30 mph.
Monday	Sunny. Breezy. High 32°. Wind chill ranging from 14 to 23. Wind northwest around 11 mph, gusting to 29 mph.
Monday night	Clear in the evening, becoming fair after midnight. Low 21°. Wind chill ranging from 15 to 22. Wind west-northwest around 7 mph, gusting to 23 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 42°. Wind west around 7 mph, gusting to 20 mph, in the morning, becoming 10 mph, gusting to 24 mph, in the afternoon.
Tuesday night	Clear. Low 26°. Wind southwest around 6 mph.

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