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, 28-Oct-2026 05:00 am

Today Mostly Sunny	Tonight Fair	Thursday Mostly Cloudy	Thursday night Partly Cloudy	Friday Partly Cloudy	Friday night Mostly Cloudy	Saturday Mostly Cloudy	Saturday night Mostly Cloudy
		<.1 in.	<.1 in.
High: 81°	Low: 55°	High: 82°	Low: 55°	High: 75°	Low: 57°	High: 73°	Low: 54°

S 3-21→7-24 mph	S 5-17 mph	SW 5-24 mph	NNE 3 mph	ESE 5-19 mph	SSE 4 mph	E 2→5-19 mph	E 4 mph

Today	Mostly sunny. Unusually hot. High 81°. Wind south around 3 mph, gusting to 21 mph, in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon.
Tonight	Fair. Mild. Low 55°. Wind south around 5 mph, gusting to 17 mph.
Thursday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. A chance of rain. Unusually hot. High 82°. Wind southwest around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. A slight chance of rain. Mild. Low 55°. Wind north-northeast around 3 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Unusually warm. High 75°. Wind east-southeast around 5 mph, gusting to 19 mph.
Friday night	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Mild. Low 57°. Wind south-southeast around 4 mph.
Saturday	Cloudy in the morning, becoming mostly cloudy in the afternoon. Warm. High 73°. Wind east around 2 mph in the morning, becoming 5 mph, gusting to 19 mph, in the afternoon.
Saturday night	Partly to mostly cloudy. Relatively mild. Low 54°. Wind east around 4 mph.
Sunday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Warm. High 73°. Wind east-southeast around 4 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Sunday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Mild. Low 60°. Wind southeast around 6 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Monday	Cloudy. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Mild. High 70°. Wind southeast around 7 mph, gusting to 21 mph, in the morning, becoming 11 mph, gusting to 26 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Monday night	Dense overcast. Patchy light fog. Rain very likely. Precipitation showery or intermittent. Mild. Low 61°. Wind southeast around 10 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Tuesday	Cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. Mild. High 65°. Wind southwest around 6 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Tuesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog. Low 50°. Wind north around 3 mph, gusting to 16 mph.

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