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, 08-Dec-2025 04:00 pm

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

Low: 21°	High: 48°	Low: 37°	High: 43°	Low: 29°	High: 42°	Low: 30°	High: 46°
WCh: 13°
SE→S 6-19 mph	SW 9-19 mph	WSW 14-20 mph	WNW 15-32 mph	NW 5-23 mph	SW→SE 2-17 mph	ESE 5-15 mph	WNW 4-18→9-26 mph

Tonight	Partly to mostly cloudy. Patchy light fog after midnight. Low 21°. Wind chill ranging from 13 to 26. Wind southeast around 6 mph, gusting to 19 mph, in the evening, becoming south after midnight.
Tuesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 48°. Wind southwest around 9 mph, gusting to 19 mph.
Tuesday night	Mostly cloudy to cloudy. Breezy. Low 37°, but temperatures rising after midnight. Wind west-southwest around 14 mph, gusting to 20 mph.
Wednesday	Partly to mostly cloudy. Breezy. High 43°. Wind west-northwest around 15 mph, gusting to 32 mph.
Wednesday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 29°. Wind northwest around 5 mph, gusting to 23 mph.
Thursday	Cloudy in the morning, becoming mostly cloudy in the afternoon. High 42°. Wind southwest around 2 mph, gusting to 17 mph, in the morning, becoming southeast in the afternoon.
Thursday night	Cloudy in the evening, becoming mostly cloudy after midnight. Low 30°. Wind east-southeast around 5 mph, gusting to 15 mph.
Friday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 46°. Wind west-northwest around 4 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 21°. Wind northwest around 6 mph, gusting to 23 mph.
Saturday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. High 36°. Wind north-northeast around 4 mph, gusting to 23 mph.
Saturday night	Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Cold. Low 15°. Wind chill ranging from 7 to 26. Wind north around 9 mph, gusting to 25 mph.
Sunday	Sunny. Cold. High 24°. Wind chill ranging from 4 to 16. Wind north around 8 mph, gusting to 25 mph.
Sunday night	Clear. Cold. Low 16°. Wind chill ranging from 9 to 15. Wind northeast around 4 mph, gusting to 19 mph, in the evening, becoming east-southeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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