OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CDT UTC Last station update CDT

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Friday, 13-Mar-2026 04:00 pm

Tonight Partly Cloudy	Saturday Partly Cloudy	Saturday night Partly Cloudy	Sunday Thunder storm	Sunday night Rain and Snow	Monday Snow	Monday night Partly Cloudy	Tuesday Partly Cloudy
			.25 in.	.35 in.	<.1 in.
Low: 36°	High: 63°	Low: 47°	High: 70°	Low: 25°	High: 27°	Low: 13°	High: 38°
				WCh: 18°	WCh: 5°
NW→NE 4-25 mph	ESE 7-25→10-27 mph	SSE 10-23 mph	S 15-32 mph	WNW 17-35 mph	WNW 17-35 mph	WNW 12-27 mph	NW→W 6-24 mph
	UV: 5 Medium

Tonight	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 36°. Wind northwest around 4 mph, gusting to 25 mph, in the evening, becoming northeast after midnight.
Saturday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Mild. High 63°. UV index up to 5. Wind east-southeast 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 partly to mostly cloudy after midnight. Low 47°. Wind south-southeast around 10 mph, gusting to 23 mph.
Sunday	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. Breezy and mild. High 70°. Wind south around 15 mph, gusting to 32 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Sunday night	Dense overcast. Patchy light fog in the evening. Rain likely in the evening, then a slight chance of a mix of rain and snow after midnight. Precipitation showery or intermittent. Windy and cold. Low 25°. Wind chill ranging from 18 to 55. Wind west-northwest around 17 mph, gusting to 35 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between a quarter and half an inch. Little or no snow accumulation expected.
Monday	Dense overcast in the morning, becoming cloudy in the afternoon. A chance of snow. Windy and very cold. High 27°, but temperatures falling in the afternoon. Wind chill ranging from 5 to 17. Wind west-northwest around 17 mph, gusting to 35 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Monday night	Fair to partly cloudy in the evening, becoming clear after midnight. Breezy and very cold. Low 13°. Wind chill as low as 1. Wind west-northwest around 12 mph, gusting to 27 mph.
Tuesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Cold. High 38°. Wind northwest around 6 mph, gusting to 24 mph, in the morning, becoming west in the afternoon.
Tuesday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Cold. Low 31°. Wind chill ranging from 23 to 34. Wind south-southeast around 5 mph, gusting to 21 mph, in the evening, becoming 10 mph, gusting to 20 mph, after midnight.
Wednesday	Partly cloudy. Mild. High 63°. UV index up to 4. Wind south around 9 mph, gusting to 25 mph, in the morning, becoming west-southwest in the afternoon.
Wednesday night	Clear. Low 35°. Wind north-northwest around 3 mph, gusting to 21 mph.
Thursday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Mild. High 66°. UV index up to 5. Wind east-southeast around 3 mph, gusting to 22 mph, in the morning, becoming south-southeast in the afternoon.
Thursday night	Partly cloudy in the evening, becoming fair after midnight. Low 40°. Wind southeast around 5 mph, gusting to 17 mph, in the evening, becoming southwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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