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, 09-Nov-2026 05:00 am

Today Sunny	Tonight Clear	Tuesday Sunny	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy	Thursday Mostly Cloudy	Thursday night Mostly Cloudy
				<.1 in.
High: 67°	Low: 39°	High: 70°	Low: 41°	High: 68°	Low: 43°	High: 54°	Low: 34°

SW calm→4-20 mph	SW 5 mph	WSW 3-19 mph	SW 2 mph	WSW 6-20→12-29 mph	NW 11-27 mph	NNW 11-28 mph	NNW 7-24 mph

Today	Sunny. Mild. High 67°. Wind southwest near calm in the morning, becoming 4 mph, gusting to 20 mph, in the afternoon.
Tonight	Clear. Low 39°. Wind southwest around 5 mph.
Tuesday	Sunny. Mild. High 70°. Wind west-southwest around 3 mph, gusting to 19 mph.
Tuesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 41°. Wind southwest around 2 mph.
Wednesday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Mild. High 68°. Wind west-southwest around 6 mph, gusting to 20 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Breezy. Low 43°. Wind northwest around 11 mph, gusting to 27 mph.
Thursday	Mostly sunny in the morning, becoming mostly cloudy in the afternoon. High 54°. Wind north-northwest around 11 mph, gusting to 28 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Low 34°. Wind north-northwest around 7 mph, gusting to 24 mph.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 48°. Wind north-northwest around 8 mph, gusting to 26 mph.
Friday night	Fair in the evening, becoming mostly clear after midnight. Low 30°. Wind north-northwest around 3 mph, gusting to 20 mph.
Saturday	Sunny. High 53°. Wind north around 2 mph, gusting to 19 mph, in the morning, becoming east in the afternoon.
Saturday night	Clear in the evening, becoming fair after midnight. Low 31°. Wind east-southeast around 3 mph.
Sunday	Partly to mostly cloudy. Patchy light fog in the morning. Mild. High 61°. Wind south-southeast around 7 mph, gusting to 20 mph.
Sunday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 44°. Wind south around 7 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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