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, 30-Oct-2026 04:00 pm

Tonight Mostly Cloudy	Saturday Mostly Cloudy	Saturday night Mostly Cloudy	Sunday Cloudy	Sunday night Cloudy	Monday Mostly Cloudy	Monday night Chance rain	Tuesday Rain likely
		<.1 in.	<.1 in.		<.1 in.	.1 in.	.5 in.
Low: 57°	High: 71°	Low: 56°	High: 67°	Low: 58°	High: 70°	Low: 60°	High: 66°

E 6 mph	E 4-17 mph	E 6-16 mph	SE 5-22 mph	SE 6-20 mph	SE 7-21→10-25 mph	SSE 11-23 mph	SSE 13-25 mph

Tonight	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Mild. Low 57°. Wind east around 6 mph.
Saturday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Mild. High 71°. Wind east around 4 mph, gusting to 17 mph.
Saturday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A chance of rain after midnight. Mild. Low 56°. Wind east around 6 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Dense overcast in the morning, becoming cloudy in the afternoon. A slight chance of rain. Mild. High 67°. Wind southeast around 5 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Cloudy. Mild. Low 58°. Wind southeast around 6 mph, gusting to 20 mph.
Monday	Dense overcast in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning. Mild. High 70°. Wind southeast around 7 mph, gusting to 21 mph, in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Breezy and mild. Low 60°. Wind south-southeast around 11 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Tuesday	Dense overcast. Patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Breezy and mild. High 66°. Wind south-southeast around 13 mph, gusting to 25 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Tuesday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Mild. Low 59°. Wind south-southeast around 9 mph, gusting to 20 mph, in the evening, becoming 5 mph, gusting to 17 mph, after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Wednesday	Mostly cloudy in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. Mild. High 71°. Wind west-southwest around 6 mph, gusting to 24 mph.
Wednesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 51°. Wind west-southwest around 4 mph, gusting to 17 mph.
Thursday	Sunny. Patchy light fog in the morning. Warm. High 73°. Wind south around 4 mph, gusting to 22 mph.
Thursday night	Clear in the evening, becoming mostly clear after midnight. Patchy light fog. Low 49°. Wind south around 4 mph.

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