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: Saturday, 31-Oct-2026 05:00 pm

Tonight Rain likely	Sunday Fog a.m.	Sunday night Mostly Cloudy	Monday Cloudy	Monday night Mostly Cloudy	Tuesday Rain likely	Tuesday night Chance rain	Wednesday Mostly Cloudy
.25 in.	<.1 in.			<.1 in.	.35 in.	<.25 in.
Low: 55°	High: 65°	Low: 59°	High: 68°	Low: 59°	High: 66°	Low: 59°	High: 70°

ESE 5 mph	ESE 7-23 mph	ESE 6-20 mph	SE 7-23→11-25 mph	SE 12-22 mph	SE 12-22 mph	S 8-19→5 mph	SW 7-25 mph

Tonight	Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog after midnight. Rain likely. Precipitation showery or intermittent. Relatively mild. Low 55°. Wind east-southeast around 5 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Sunday	Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Mild. High 65°. Wind east-southeast around 7 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Mild. Low 59°. Wind east-southeast around 6 mph, gusting to 20 mph.
Monday	Cloudy. Mild. High 68°. Wind southeast around 7 mph, gusting to 23 mph, in the morning, becoming 11 mph, gusting to 25 mph, in the afternoon.
Monday night	Mostly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Breezy and mild. Low 59°. Wind southeast around 12 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Dense overcast. Rain likely. Precipitation showery or intermittent. Breezy and mild. High 66°. Wind southeast around 12 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Tuesday night	Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Mild. Low 59°. Wind south around 8 mph, gusting to 19 mph, in the evening, becoming 5 mph after midnight. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Wednesday	Partly to mostly cloudy. Mild. High 70°. Wind southwest around 7 mph, gusting to 25 mph.
Wednesday night	Fair. Patchy light fog after midnight. Low 48°. Wind southwest around 5 mph, gusting to 18 mph.
Thursday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Mild. High 67°. Wind west-southwest around 6 mph, gusting to 24 mph.
Thursday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 51°. Wind west around 4 mph, gusting to 16 mph.
Friday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. High 58°. Wind northwest around 5 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Cloudy. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 50°. Wind north-northwest around 2 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

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