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, 16-Feb-2026 04:00 pm

Tonight Partly Cloudy	Tuesday Partly Cloudy	Tuesday night Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Clear	Friday Partly Cloudy

Low: 40°	High: 71°	Low: 49°	High: 76°	Low: 45°	High: 74°	Low: 36°	High: 52°

S 7-24 mph	S 6-18→9-25 mph	S 13-23 mph	WSW 10-24→7-27 mph	SE 4-15 mph	SE→SSW 6-21→12-28 mph	WSW 12-27 mph	W 11-29 mph

Tonight	Partly cloudy. Low 40°. Wind south around 7 mph, gusting to 24 mph.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually warm. High 71°. Wind south around 6 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 25 mph, in the afternoon.
Tuesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy and relatively mild. Low 49°. Wind south around 13 mph, gusting to 23 mph.
Wednesday	Sunny in the morning, becoming mostly sunny in the afternoon. Exceptionally warm. High 76°. Wind west-southwest around 10 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 27 mph, in the afternoon.
Wednesday night	Fair to partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Relatively mild. Low 45°. Wind southeast around 4 mph, gusting to 15 mph.
Thursday	Sunny. Moderate fog in the morning. Exceptionally warm. High 74°. Wind southeast around 6 mph, gusting to 21 mph, in the morning, becoming south-southwest around 12 mph, gusting to 28 mph, in the afternoon.
Thursday night	Clear. Breezy. Low 36°. Wind west-southwest around 12 mph, gusting to 27 mph.
Friday	Partly cloudy. High 52°. Wind west around 11 mph, gusting to 29 mph.
Friday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind west around 5 mph, gusting to 23 mph, in the evening, becoming northwest after midnight.
Saturday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 46°. Wind northwest around 7 mph, gusting to 25 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon.
Saturday night	Partly cloudy in the evening, becoming clear after midnight. Low 26°. Wind chill ranging from 19 to 39. Wind northwest around 9 mph, gusting to 25 mph.
Sunday	Sunny. Breezy. High 33°. Wind chill ranging from 16 to 22. Wind northwest around 13 mph, gusting to 32 mph, in the morning, becoming 16 mph, gusting to 32 mph, in the afternoon.
Sunday night	Clear. Breezy and cold. Low 20°. Wind chill ranging from 10 to 22. Wind northwest around 11 mph, gusting to 28 mph.

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