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, 09-Nov-2026 04:00 pm

Tonight Fog late	Tuesday Fog a.m.	Tuesday night Fog late	Wednesday Fog a.m.	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Fog late	Friday Fog a.m.
			<.1 in.
Low: 46°	High: 69°	Low: 43°	High: 64°	Low: 40°	High: 49°	Low: 33°	High: 47°

WSW 5-25 mph	WSW 3-18 mph	WSW 2 mph	SW→W 7-20→12-28 mph	NW 12-26→9-21 mph	NW 7-23→11-26 mph	NW 6-22 mph	NNW 8-25 mph

Tonight	Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 46°. Wind west-southwest around 5 mph, gusting to 25 mph.
Tuesday	Partly to mostly sunny. Moderate fog in the morning. Mild. High 69°. Wind west-southwest around 3 mph, gusting to 18 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. Low 43°. Wind west-southwest around 2 mph.
Wednesday	Mostly cloudy to cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain. Mild. High 64°. Wind southwest around 7 mph, gusting to 20 mph, in the morning, becoming west around 12 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog after midnight. Low 40°. Wind northwest around 12 mph, gusting to 26 mph, in the evening, becoming 9 mph, gusting to 21 mph, after midnight.
Thursday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. High 49°. Wind northwest around 7 mph, gusting to 23 mph, in the morning, becoming 11 mph, gusting to 26 mph, in the afternoon.
Thursday night	Mostly clear in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 33°. Wind northwest around 6 mph, gusting to 22 mph.
Friday	Mostly sunny in the morning, becoming sunny in the afternoon. Moderate fog in the morning. High 47°. Wind north-northwest around 8 mph, gusting to 25 mph.
Friday night	Mostly clear in the evening, becoming clear after midnight. Low 30°. Wind north-northwest around 4 mph, gusting to 19 mph.
Saturday	Sunny. High 52°. Wind north-northwest around 2 mph, gusting to 19 mph.
Saturday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 33°. Wind east around 2 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 55°. Wind southeast around 5 mph, gusting to 23 mph.
Sunday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 34°. Wind southeast around 4 mph, gusting to 16 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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