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: Thursday, 12-Feb-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Friday Mostly Sunny	Friday night Partly Cloudy	Saturday Rain likely	Saturday night Rain likely	Sunday Fog a.m.	Sunday night Clear
				.5 in.	1.0 in.
High: 57°	Low: 31°	High: 62°	Low: 36°	High: 55°	Low: 41°	High: 58°	Low: 34°

SSE 3-20→7-25 mph	SSE 5-21 mph	SSE 5-24 mph	SSE 2-16 mph	SE 4-15 mph	E 7-19 mph	NNE 7-23 mph	NNW→WSW 2-16 mph

Today	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 57°. Wind south-southeast around 3 mph, gusting to 20 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon.
Tonight	Partly cloudy in the evening, becoming mostly clear after midnight. Low 31°. Wind south-southeast around 5 mph, gusting to 21 mph.
Friday	Partly to mostly sunny. Unusually mild. High 62°. Wind south-southeast around 5 mph, gusting to 24 mph.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 36°. Wind south-southeast around 2 mph, gusting to 16 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 55°. Wind southeast around 4 mph, gusting to 15 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Saturday night	Dense overcast. Patchy light fog. Rain likely in the evening, then a chance of rain after midnight. Low 41°. Wind east around 7 mph, gusting to 19 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Sunday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Relatively mild. High 58°. Wind north-northeast around 7 mph, gusting to 23 mph.
Sunday night	Clear. Low 34°. Wind north-northwest around 2 mph, gusting to 16 mph, in the evening, becoming west-southwest after midnight.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually mild. High 64°. Wind south-southwest around 6 mph, gusting to 22 mph.
Monday night	Partly cloudy. Patchy light fog after midnight. Low 41°. Wind south-southeast around 6 mph, gusting to 16 mph.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually mild. High 68°. Wind south around 5 mph in the morning, becoming 8 mph, gusting to 23 mph, in the afternoon.
Tuesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy and relatively mild. Low 50°. Wind south-southeast around 12 mph, gusting to 20 mph, in the evening, becoming south-southwest around 16 mph, gusting to 23 mph, after midnight.
Wednesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Breezy and unusually mild. High 65°. Wind west-southwest around 15 mph, gusting to 30 mph.
Wednesday night	Partly to mostly cloudy. Patchy light fog after midnight. Low 38°. Wind north-northwest around 4 mph, gusting to 20 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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