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: Tuesday, 23-Dec-2025 05:00 am

Today Mostly Sunny	Tonight Partly Cloudy	Wednesday Cloudy	Wednesday night Fog late	Thursday Mostly Cloudy	Thursday night Fog	Friday Mostly Sunny	Friday night Fog late
		<.1 in.		<.1 in.
High: 63°	Low: 40°	High: 61°	Low: 45°	High: 55°	Low: 47°	High: 67°	Low: 41°

WSW 5-18 mph	N→ENE 2 mph	SE→S 6 mph	SSW→WSW 4 mph	NE→E 3 mph	SE→S 5 mph	WSW 7-21 mph	WNW→E 2 mph

Today	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually mild. High 63°. Wind west-southwest around 5 mph, gusting to 18 mph.
Tonight	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Relatively mild. Low 40°. Wind north around 2 mph in the evening, becoming east-northeast after midnight.
Wednesday	Cloudy. A slight chance of rain. Unusually mild. High 61°. Wind southeast around 6 mph in the morning, becoming south in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Relatively mild. Low 45°. Wind south-southwest around 4 mph in the evening, becoming west-southwest after midnight.
Thursday	Mostly cloudy to cloudy. A slight chance of rain. Relatively mild. High 55°. Wind northeast around 3 mph in the morning, becoming east in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. Relatively mild. Low 47°, but temperatures rising after midnight. Wind southeast around 5 mph in the evening, becoming south after midnight.
Friday	Mostly sunny in the morning, becoming sunny in the afternoon. Unusually mild. High 67°. Wind west-southwest around 7 mph, gusting to 21 mph.
Friday night	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. Relatively mild. Low 41°. Wind west-northwest around 2 mph in the evening, becoming east after midnight.
Saturday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. Unusually mild. High 68°. Wind southeast around 6 mph, gusting to 15 mph.
Saturday night	Fair in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then patchy light fog after midnight. Relatively mild. Low 41°. Wind southwest around 8 mph, gusting to 21 mph, in the evening, becoming west-northwest after midnight.
Sunday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Breezy. High 46°. Wind west-northwest around 11 mph, gusting to 29 mph.
Sunday night	Fair to partly cloudy. Breezy. Low 23°. Wind chill ranging from 14 to 33. Wind west-northwest around 11 mph, gusting to 27 mph.
Monday	Partly cloudy in the morning, becoming sunny in the afternoon. Breezy. High 31°. Wind chill ranging from 12 to 21. Wind northwest around 12 mph, gusting to 30 mph.
Monday night	Clear. Low 19°. Wind chill ranging from 12 to 20. Wind northwest around 8 mph, gusting to 25 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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