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: Friday, 13-Feb-2026 05:00 am

Today Sunny	Tonight Partly Cloudy	Saturday Rain likely	Saturday night Rain likely	Sunday Fog a.m.	Sunday night Clear	Monday Partly Cloudy	Monday night Partly Cloudy
		.5 in.	.35 in.
High: 66°	Low: 42°	High: 56°	Low: 41°	High: 59°	Low: 33°	High: 66°	Low: 39°

S 5-25 mph	SSW 2-18 mph	SSE 3-16 mph	ENE 6-17 mph	NNE 6-23 mph	WNW→SW 3-16 mph	SSW 6-24 mph	S 5-18 mph

Today	Sunny. Unusually mild. High 66°. Wind south around 5 mph, gusting to 25 mph.
Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Relatively mild. Low 42°. Wind south-southwest around 2 mph, gusting to 18 mph.
Saturday	Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. Relatively mild. High 56°. Wind south-southeast around 3 mph, gusting to 16 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Saturday night	Dense overcast. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Low 41°. Wind east-northeast around 6 mph, gusting to 17 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Sunday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Mild. High 59°. Wind north-northeast around 6 mph, gusting to 23 mph.
Sunday night	Clear. Low 33°. Wind west-northwest around 3 mph, gusting to 16 mph, in the evening, becoming southwest after midnight.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Unusually mild. High 66°. Wind south-southwest around 6 mph, gusting to 24 mph.
Monday night	Partly cloudy. Low 39°. Wind south around 5 mph, gusting to 18 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Unusually mild. High 66°. Wind south around 3 mph in the morning, becoming 8 mph, gusting to 23 mph, in the afternoon.
Tuesday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Relatively mild. Low 45°. Wind south around 9 mph, gusting to 22 mph.
Wednesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Exceptionally warm. High 73°. Wind west-southwest around 7 mph, gusting to 24 mph.
Wednesday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Relatively mild. Low 46°. Wind south-southwest around 2 mph in the evening, becoming southeast after midnight.
Thursday	Cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. Mild. High 61°. Wind east-southeast around 6 mph in the morning, becoming south-southeast around 10 mph, gusting to 21 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly to mostly cloudy in the evening, becoming fair after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Windy and unusually mild. Low 56°. Wind south-southwest around 16 mph, gusting to 27 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.

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