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: Monday, 02-Nov-2026 04:00 pm

Tonight Mostly Cloudy	Tuesday Rain likely	Tuesday night Rain likely	Wednesday Fog a.m.	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Partly Cloudy	Friday Fog a.m.
<.1 in.	.75 in.	.5 in.
Low: 60°	High: 66°	Low: 59°	High: 65°	Low: 48°	High: 64°	Low: 46°	High: 57°

SSE 12-20 mph	SSE 13-23 mph	SSW 8-22 mph	WSW 8-27 mph	WSW 6-18 mph	WSW 8-23 mph	W 4-15 mph	NW 6-23 mph

Tonight	Cloudy in the evening, becoming mostly cloudy to cloudy 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 12 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than 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. Precipitation showery or intermittent. Breezy and mild. High 66°. Wind south-southeast around 13 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Tuesday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Mild. Low 59°. Wind south-southwest around 8 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Wednesday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Mild. High 65°. Wind west-southwest around 8 mph, gusting to 27 mph.
Wednesday night	Partly cloudy in the evening, becoming clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 48°. Wind west-southwest around 6 mph, gusting to 18 mph.
Thursday	Sunny. Moderate fog in the morning. Mild. High 64°. Wind west-southwest around 8 mph, gusting to 23 mph.
Thursday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 46°. Wind west around 4 mph, gusting to 15 mph.
Friday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. High 57°. Wind northwest around 6 mph, gusting to 23 mph.
Friday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. Low 43°. Wind northwest around 4 mph, gusting to 19 mph.
Saturday	Mostly cloudy. Patchy light fog in the morning. High 57°. Wind west-northwest around 3 mph, gusting to 20 mph.
Saturday night	Clear. Low 44°. Wind west-southwest around 5 mph in the evening, becoming 8 mph after midnight.
Sunday	Mostly cloudy in the morning, becoming cloudy in the afternoon. Breezy. High 56°. Wind west around 13 mph, gusting to 30 mph.
Sunday night	Cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Low 44°. Wind west-northwest around 9 mph, gusting to 28 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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