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: Wednesday, 04-Nov-2026 04:00 pm

Tonight Fog late	Thursday Fog a.m.	Thursday night Mostly Cloudy	Friday Mostly Cloudy	Friday night Fog late	Saturday Fog a.m.	Saturday night Partly Cloudy	Sunday Fog a.m.

Low: 41°	High: 60°	Low: 43°	High: 55°	Low: 34°	High: 56°	Low: 35°	High: 63°

WSW 6-21 mph	W 8-21→11-27 mph	WNW 6-20 mph	NNW 7-24 mph	NNW 3-19 mph	NNW 2-21 mph	WNW 2 mph	WSW 4-21 mph

Tonight	Partly cloudy in the evening, becoming clear after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Low 41°. Wind west-southwest around 6 mph, gusting to 21 mph.
Thursday	Sunny in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. High 60°. Wind west around 8 mph, gusting to 21 mph, in the morning, becoming 11 mph, gusting to 27 mph, in the afternoon.
Thursday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 43°. Wind west-northwest around 6 mph, gusting to 20 mph.
Friday	Mostly cloudy to cloudy in the morning, becoming mostly sunny in the afternoon. High 55°. Wind north-northwest around 7 mph, gusting to 24 mph.
Friday night	Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 34°. Wind north-northwest around 3 mph, gusting to 19 mph.
Saturday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 56°. Wind north-northwest around 2 mph, gusting to 21 mph.
Saturday night	Partly cloudy. Low 35°. Wind west-northwest around 2 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Mild. High 63°. Wind west-southwest around 4 mph, gusting to 21 mph.
Sunday night	Clear. Patchy light fog after midnight. Low 36°. Wind west-southwest around 2 mph.
Monday	Sunny. Patchy light fog in the morning. Mild. High 66°. Wind southwest around 2 mph, gusting to 21 mph.
Monday night	Clear. Moderate fog after midnight. Low 37°. Wind southwest around 4 mph.
Tuesday	Sunny. Moderate fog in the morning. Mild. High 66°. Wind west-southwest around 5 mph, gusting to 24 mph.
Tuesday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 38°. Wind west-northwest around 3 mph in the evening, becoming north-northwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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