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, 15-Dec-2025 04:00 pm

Tonight Partly Cloudy	Tuesday Mostly Sunny	Tuesday night Mostly Cloudy	Wednesday Partly Cloudy	Wednesday night Mostly Cloudy	Thursday Rain likely	Thursday night Partly Cloudy	Friday Partly Cloudy
					.35 in.
Low: 21°	High: 49°	Low: 27°	High: 53°	Low: 38°	High: 47°	Low: 22°	High: 41°
						WCh: 16°
SW 4-23 mph	SW 6-21 mph	SW 6 mph	W→SE 3 mph	SSE 8→11-17 mph	SW 12-30 mph	WNW 16-32→11-28 mph	WNW→S 5-20 mph

Tonight	Fair to partly cloudy. Low 21°. Wind southwest around 4 mph, gusting to 23 mph.
Tuesday	Partly to mostly sunny. Relatively mild. High 49°. Wind southwest around 6 mph, gusting to 21 mph.
Tuesday night	Partly to mostly cloudy. Low 27°. Wind southwest around 6 mph.
Wednesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 53°. Wind west around 3 mph in the morning, becoming southeast in the afternoon.
Wednesday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 38°, but temperatures rising after midnight. Wind south-southeast around 8 mph in the evening, becoming 11 mph, gusting to 17 mph, after midnight.
Thursday	Dense overcast in the morning, becoming partly cloudy in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Breezy. High 47°. Wind southwest around 12 mph, gusting to 30 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Thursday night	Fair to partly cloudy in the evening, becoming clear after midnight. Breezy. Low 22°. Wind chill ranging from 16 to 36. Wind west-northwest around 16 mph, gusting to 32 mph, in the evening, becoming 11 mph, gusting to 28 mph, after midnight.
Friday	Sunny in the morning, becoming partly cloudy in the afternoon. High 41°. Wind west-northwest around 5 mph, gusting to 20 mph, in the morning, becoming south in the afternoon.
Friday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 26°. Wind chill ranging from 17 to 31. Wind south-southeast around 10 mph, gusting to 17 mph.
Saturday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 56°. Wind south-southeast around 9 mph, gusting to 21 mph, in the morning, becoming south-southwest in the afternoon.
Saturday night	Partly to mostly cloudy. Low 25°. Wind north-northwest around 7 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 44°. Wind northeast around 6 mph, gusting to 18 mph.
Sunday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 34°. Wind east around 8 mph, gusting to 15 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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