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: Wednesday, 14-Oct-2026 04:00 pm

Tonight Thunder storm	Thursday Rain likely	Thursday night Chance rain	Friday Fog a.m.	Friday night Mostly Cloudy	Saturday Mostly Sunny	Saturday night Clear	Sunday Sunny
.1 in.	.25 in.	<.25 in.	<.1 in.
Low: 64°	High: 72°	Low: 55°	High: 57°	Low: 43°	High: 61°	Low: 40°	High: 65°

NW→E 2 mph	SSE→SW 4→9-18 mph	WNW 11-26 mph	WNW 14-31 mph	NNW 12-28→9-23 mph	N 4-23 mph	SE 2 mph	SE 5-23 mph
					UV: 5 Medium		UV: 4 Medium

Tonight	Cloudy. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Mild. Low 64°. Wind northwest around 2 mph in the evening, becoming east after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Thursday	Dense overcast in the morning, becoming mostly cloudy in the afternoon. Patchy light fog. Rain likely. Precipitation showery or intermittent. Mild. High 72°. Wind south-southeast around 4 mph in the morning, becoming southwest around 9 mph, gusting to 18 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Thursday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain. Breezy. Low 55°. Wind west-northwest around 11 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Friday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Breezy. High 57°. Wind west-northwest around 14 mph, gusting to 31 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 43°. Wind north-northwest around 12 mph, gusting to 28 mph, in the evening, becoming 9 mph, gusting to 23 mph, after midnight.
Saturday	Mostly sunny in the morning, becoming sunny in the afternoon. High 61°. UV index up to 5. Wind north around 4 mph, gusting to 23 mph.
Saturday night	Clear. Low 40°. Wind southeast around 2 mph.
Sunday	Sunny. High 65°. UV index up to 4. Wind southeast around 5 mph, gusting to 23 mph.
Sunday night	Clear in the evening, becoming fair after midnight. Low 43°. Wind southeast around 3 mph, gusting to 16 mph.
Monday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 69°. UV index up to 4. Wind south-southeast around 3 mph, gusting to 21 mph.
Monday night	Partly cloudy. Low 45°. Wind southeast around 2 mph.
Tuesday	Partly cloudy in the morning, becoming sunny in the afternoon. High 70°. Wind southeast around 3 mph, gusting to 16 mph.
Tuesday night	Mostly clear in the evening, becoming clear after midnight. Low 45°. Wind southeast around 2 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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