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: Sunday, 08-Nov-2026 04:00 pm

Tonight Fog	Monday Fog a.m.	Monday night Fair	Tuesday Mostly Sunny	Tuesday night Partly Cloudy	Wednesday Rain likely	Wednesday night Rain likely	Thursday Fog a.m.
					.35 in.	.5 in.
Low: 40°	High: 67°	Low: 40°	High: 69°	Low: 42°	High: 66°	Low: 48°	High: 51°

W→NW 4-26 mph	SW 3-20 mph	SW 4 mph	SW 3-17 mph	SW 2 mph	SSW→WSW 5-19 mph	NNW 11-28 mph	NNW 10-25 mph

Tonight	Fair. Patchy light fog. Low 40°. Wind west around 4 mph, gusting to 26 mph, in the evening, becoming northwest after midnight.
Monday	Mostly sunny. Patchy light fog in the morning. Mild. High 67°. Wind southwest around 3 mph, gusting to 20 mph.
Monday night	Fair. Low 40°. Wind southwest around 4 mph.
Tuesday	Mostly sunny. Mild. High 69°. Wind southwest around 3 mph, gusting to 17 mph.
Tuesday night	Fair in the evening, becoming partly cloudy after midnight. Low 42°. Wind southwest around 2 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Moderate fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Mild. High 66°. Wind south-southwest around 5 mph, gusting to 19 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Wednesday night	Cloudy. Light to moderate fog in the evening, then patchy light fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Breezy. Low 48°. Wind north-northwest around 11 mph, gusting to 28 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Thursday	Mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. High 51°. Wind north-northwest around 10 mph, gusting to 25 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 37°. Wind north-northwest around 9 mph, gusting to 24 mph.
Friday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 45°. Wind north-northwest around 9 mph, gusting to 26 mph.
Friday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 32°. Wind north-northwest around 4 mph, gusting to 19 mph.
Saturday	Sunny in the morning, becoming mostly sunny in the afternoon. High 53°. Wind west-northwest around 4 mph, gusting to 22 mph, in the morning, becoming west-southwest in the afternoon.
Saturday night	Clear. Low 34°. Wind south around 4 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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