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: Saturday, 14-Feb-2026 04:00 pm

Tonight Rain likely	Sunday Fog a.m.	Sunday night Fog late	Monday Fog a.m.	Monday night Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Thunder storm	Wednesday Fog a.m.
1.0 in.						<.1 in.
Low: 41°	High: 61°	Low: 38°	High: 67°	Low: 42°	High: 71°	Low: 55°	High: 75°

ENE 7-17 mph	NNE 6-22 mph	WSW 2-15 mph	SSW 5-18→8-24 mph	SSW 6-18 mph	SSE 6-16→10-26 mph	SSE→SSW 13-24 mph	WSW 9-26 mph

Tonight	Dense overcast. Patchy light fog. Rain likely in the evening, then a chance of rain after midnight. Low 41°. Wind east-northeast around 7 mph, gusting to 17 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Sunday	Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Mild. High 61°. Wind north-northeast around 6 mph, gusting to 22 mph.
Sunday night	Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 38°. Wind west-southwest around 2 mph, gusting to 15 mph.
Monday	Partly cloudy. Patchy light fog in the morning. Unusually mild. High 67°. Wind south-southwest around 5 mph, gusting to 18 mph, in the morning, becoming 8 mph, gusting to 24 mph, in the afternoon.
Monday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Relatively mild. Low 42°. Wind south-southwest around 6 mph, gusting to 18 mph.
Tuesday	Partly to mostly cloudy. Unusually warm. High 71°. Wind south-southeast around 6 mph, gusting to 16 mph, in the morning, becoming 10 mph, gusting to 26 mph, in the afternoon.
Tuesday night	Partly to mostly cloudy. A chance of rain after midnight. Scattered thundershowers possible. Breezy and unusually mild. Low 55°. Wind south-southeast around 13 mph, gusting to 24 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Wednesday	Sunny. Patchy light fog in the morning. Exceptionally warm. High 75°. Wind west-southwest around 9 mph, gusting to 26 mph.
Wednesday night	Mostly clear. Relatively mild. Low 42°. Wind southwest around 2 mph, gusting to 16 mph, in the evening, becoming southeast after midnight.
Thursday	Sunny. Patchy light fog in the morning. Unusually warm. High 70°. Wind southeast around 4 mph in the morning, becoming south around 8 mph, gusting to 23 mph, in the afternoon.
Thursday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Low 40°. Wind southwest around 7 mph, gusting to 17 mph, in the evening, becoming west around 10 mph, gusting to 25 mph, after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Friday	Mostly cloudy. Patchy light fog in the morning. High 47°. Wind northwest around 8 mph, gusting to 26 mph.
Friday night	Clear in the evening, becoming fair after midnight. Low 29°. Wind west-northwest around 4 mph, gusting to 20 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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