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: Monday, 16-Feb-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Sunny	Wednesday night Fog late	Thursday Chance rain	Thursday night Fog
						<.25 in.
High: 70°	Low: 46°	High: 73°	Low: 54°	High: 76°	Low: 44°	High: 74°	Low: 40°

SSW 4-22→8-26 mph	SSW 6-22 mph	SSW 6-20→10-27 mph	SSW 13-26 mph	WSW 9-28 mph	SE 3-17 mph	S 6-21→9-27 mph	WSW 9-20→14-29 mph

Today	Partly cloudy. Unusually warm. High 70°. Wind south-southwest around 4 mph, gusting to 22 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Tonight	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Relatively mild. Low 46°. Wind south-southwest around 6 mph, gusting to 22 mph.
Tuesday	Partly to mostly cloudy. Unusually warm. High 73°. Wind south-southwest around 6 mph, gusting to 20 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon.
Tuesday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy and unusually mild. Low 54°. Wind south-southwest around 13 mph, gusting to 26 mph.
Wednesday	Sunny. Exceptionally warm. High 76°. Wind west-southwest around 9 mph, gusting to 28 mph.
Wednesday night	Fair in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Relatively mild. Low 44°. Wind southeast around 3 mph, gusting to 17 mph.
Thursday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. A chance of rain in the afternoon. Unusually warm. High 74°. Wind south around 6 mph, gusting to 21 mph, in the morning, becoming 9 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Thursday night	Clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog. Breezy. Low 40°. Wind west-southwest around 9 mph, gusting to 20 mph, in the evening, becoming 14 mph, gusting to 29 mph, after midnight.
Friday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Breezy. High 47°. Wind west-southwest around 15 mph, gusting to 34 mph.
Friday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind west-northwest around 8 mph, gusting to 27 mph.
Saturday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. A chance of rain in the afternoon. High 47°. Wind north-northwest around 6 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Cloudy in the evening, becoming mostly clear after midnight. Patchy light fog. A chance of a mix of rain and snow in the evening, then a slight chance of a mix of rain and snow after midnight. Low 31°. Wind chill ranging from 24 to 39. Wind north-northwest around 8 mph, gusting to 24 mph, in the evening, becoming 11 mph, gusting to 25 mph, after midnight. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. No snow accumulation expected.
Sunday	Sunny. Patchy light fog in the morning. Breezy. High 42°. Wind north-northwest around 12 mph, gusting to 31 mph.
Sunday night	Clear. Low 26°. Wind chill ranging from 16 to 35. Wind north-northwest around 10 mph, gusting to 27 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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