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: Tuesday, 27-Oct-2026 04:00 pm

Tonight Fog late	Wednesday Fog a.m.	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Fog	Friday Fog a.m.	Friday night Mostly Cloudy	Saturday Mostly Cloudy
				<.1 in.	<.1 in.
Low: 51°	High: 76°	Low: 51°	High: 77°	Low: 53°	High: 70°	Low: 57°	High: 72°

S 5-19 mph	S 6-23 mph	S 6 mph	SSW→W 5-21 mph	N→NE 3 mph	ESE 5-16 mph	SE 4 mph	E 3-18 mph

Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 51°. Wind south around 5 mph, gusting to 19 mph.
Wednesday	Mostly sunny. Moderate fog in the morning. Unusually warm. High 76°. Wind south around 6 mph, gusting to 23 mph.
Wednesday night	Fair. Light to moderate fog after midnight. Low 51°. Wind south around 6 mph.
Thursday	Partly to mostly sunny. Light to moderate fog in the morning. Unusually warm. High 77°. Wind south-southwest around 5 mph, gusting to 21 mph, in the morning, becoming west in the afternoon.
Thursday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain. Low 53°. Wind north around 3 mph in the evening, becoming northeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Mild. High 70°. Wind east-southeast around 5 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Mostly cloudy in the evening, becoming cloudy after midnight. Mild. Low 57°. Wind southeast around 4 mph.
Saturday	Cloudy in the morning, becoming mostly cloudy in the afternoon. Mild. High 72°. Wind east around 3 mph, gusting to 18 mph.
Saturday night	Mostly cloudy to cloudy. Mild. Low 56°. Wind east-southeast around 4 mph.
Sunday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Warm. High 73°. Wind southeast around 4 mph, gusting to 22 mph.
Sunday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Mild. Low 58°. Wind southeast around 4 mph, gusting to 18 mph.
Monday	Mostly cloudy to cloudy. A slight chance of rain. Mild. High 72°. Wind south-southeast around 3 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Dense overcast. Patchy light fog after midnight. A chance of rain in the evening, then rain likely after midnight. Mild. Low 61°. Wind east-southeast around 6 mph, gusting to 19 mph, in the evening, becoming 10 mph, gusting to 22 mph, after midnight. Chance of precipitation 80 percent. Precipitation mostly around an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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