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: Tuesday, 03-Nov-2026 04:00 pm

Tonight Chance rain	Wednesday Mostly Cloudy	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Mostly Cloudy	Friday Fog a.m.	Friday night Fog late	Saturday Fog a.m.
.1 in.
Low: 61°	High: 65°	Low: 47°	High: 64°	Low: 46°	High: 59°	Low: 38°	High: 58°

SSW 8-24 mph	WSW 10-28 mph	WSW 6-22 mph	WSW 7-26 mph	WNW 4-17 mph	N 7-25 mph	N 3-19 mph	N 2-20 mph

Tonight	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Mild. Low 61°. Wind south-southwest around 8 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Wednesday	Mostly cloudy to cloudy. Mild. High 65°. Wind west-southwest around 10 mph, gusting to 28 mph.
Wednesday night	Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 47°. Wind west-southwest around 6 mph, gusting to 22 mph.
Thursday	Sunny. Moderate fog in the morning. Mild. High 64°. Wind west-southwest around 7 mph, gusting to 26 mph.
Thursday night	Mostly cloudy. Low 46°. Wind west-northwest around 4 mph, gusting to 17 mph.
Friday	Partly to mostly sunny. Patchy light fog in the morning. High 59°. Wind north around 7 mph, gusting to 25 mph.
Friday night	Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 38°. Wind north around 3 mph, gusting to 19 mph.
Saturday	Partly cloudy. Patchy light fog in the morning. High 58°. Wind north around 2 mph, gusting to 20 mph.
Saturday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 41°. Wind north-northwest near calm in the evening, becoming southwest after midnight.
Sunday	Sunny. Patchy light fog in the morning. High 60°. Wind north-northwest around 0 mph, gusting to 20 mph, in the morning, becoming 4 mph, gusting to 22 mph, in the afternoon.
Sunday night	Clear. Patchy light fog in the evening, then moderate fog after midnight. Low 37°. Wind west-northwest around 2 mph.
Monday	Sunny. Light to moderate fog in the morning. Mild. High 66°. Wind southwest around 4 mph in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon.
Monday night	Clear in the evening, becoming partly cloudy after midnight. Low 44°. Wind southwest around 5 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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