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: Wednesday, 14-Oct-2026 05:00 am

Today Thunder storm	Tonight Rain likely	Thursday Rain likely	Thursday night Chance rain	Friday Fog a.m.	Friday night Mostly Cloudy	Saturday Sunny	Saturday night Fog late
<.25 in.	.35 in.	.5 in.	.25 in.
High: 78°	Low: 67°	High: 74°	Low: 59°	High: 60°	Low: 43°	High: 61°	Low: 41°

NNE→E 2 mph	ENE→ESE 2 mph	SSE→SW 6-17 mph	SW→NW 8-25→13-30 mph	NW 15-31 mph	NW 12-28→8-23 mph	N→ENE 3-22 mph	SE 3 mph
						UV: 5 Medium

Today	Cloudy. Rain likely. Scattered thundershowers possible. Warm. High 78°. Wind north-northeast around 2 mph in the morning, becoming east in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Tonight	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Warm. Low 67°. Wind east-northeast around 2 mph in the evening, becoming east-southeast after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Thursday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog. Rain likely. Precipitation showery or intermittent. Warm. High 74°. Wind south-southeast around 6 mph, gusting to 17 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Thursday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Moderate fog in the evening, then patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Mild. Low 59°. Wind southwest around 8 mph, gusting to 25 mph, in the evening, becoming northwest around 13 mph, gusting to 30 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Friday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 60°, but temperatures falling in the afternoon. Wind northwest around 15 mph, gusting to 31 mph.
Friday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 43°. Wind northwest around 12 mph, gusting to 28 mph, in the evening, becoming 8 mph, gusting to 23 mph, after midnight.
Saturday	Sunny. High 61°. UV index up to 5. Wind north around 3 mph, gusting to 22 mph, in the morning, becoming east-northeast in the afternoon.
Saturday night	Clear. Patchy light fog after midnight. Low 41°. Wind southeast around 3 mph.
Sunday	Sunny. Patchy light fog in the morning. High 66°. UV index up to 4. Wind south-southeast around 5 mph, gusting to 24 mph.
Sunday night	Fair to partly cloudy. Low 45°. Wind south-southeast around 5 mph, gusting to 18 mph.
Monday	Partly cloudy. High 69°. UV index up to 4. Wind south around 4 mph, gusting to 20 mph.
Monday night	Mostly cloudy. A chance of rain. Low 51°. Wind south-southeast around 3 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain. High 65°. Wind south-southeast around 3 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Clear. Patchy light fog. Low 48°. Wind south-southeast around 2 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 5.1.6 (b5016) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5