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, 23-Feb-2026 04:00 pm

Tonight Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Mostly Cloudy	Wednesday Mostly Sunny	Wednesday night Partly Cloudy	Thursday Mostly Cloudy	Thursday night Clear	Friday Sunny
				<.1 in.
Low: 15°	High: 48°	Low: 29°	High: 54°	Low: 37°	High: 55°	Low: 30°	High: 63°
WCh: 8°
W→S 1-21→4 mph	SSW 8-18→13-21 mph	SW→WNW 9-18→4 mph	NNW→NNE 2-18 mph	E 5 mph	NE 4-23 mph	N→SW 2-17 mph	SSW 4-19→9-24 mph

Tonight	Fair in the evening, becoming fair to partly cloudy after midnight. Cold. Low 15°. Wind chill ranging from 8 to 28. Wind west around 1 mph, gusting to 21 mph, in the evening, becoming south around 4 mph after midnight.
Tuesday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 48°. Wind south-southwest around 8 mph, gusting to 18 mph, in the morning, becoming 13 mph, gusting to 21 mph, in the afternoon.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 29°. Wind southwest around 9 mph, gusting to 18 mph, in the evening, becoming west-northwest around 4 mph after midnight.
Wednesday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 54°. Wind north-northwest around 2 mph, gusting to 18 mph, in the morning, becoming north-northeast in the afternoon.
Wednesday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. A chance of rain after midnight. Low 37°. Wind east around 5 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Mostly cloudy to cloudy in the morning, becoming mostly sunny in the afternoon. Relatively mild. High 55°. Wind northeast around 4 mph, gusting to 23 mph.
Thursday night	Fair in the evening, becoming clear after midnight. Low 30°. Wind north around 2 mph, gusting to 17 mph, in the evening, becoming southwest after midnight.
Friday	Sunny. Mild. High 63°. Wind south-southwest around 4 mph, gusting to 19 mph, in the morning, becoming 9 mph, gusting to 24 mph, in the afternoon.
Friday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 34°. Wind southwest around 6 mph, gusting to 17 mph, in the evening, becoming 3 mph after midnight.
Saturday	Mostly sunny in the morning, becoming sunny in the afternoon. Unusually mild. High 66°. Wind east-southeast around 3 mph, gusting to 15 mph, in the morning, becoming south-southwest around 7 mph, gusting to 23 mph, in the afternoon.
Saturday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind chill ranging from 23 to 61. Wind north-northwest around 10 mph, gusting to 20 mph.
Sunday	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of a mix of sleet and snow in the afternoon. High 40°. Wind northeast around 9 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected.
Sunday night	Dense overcast. A chance of sleet in the evening, then a slight chance of sleet after midnight. Low 31°. Wind chill ranging from 23 to 31. Wind east around 8 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. No ice (on ground) accumulation expected.

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