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: Wednesday, 24-Dec-2025 04:00 pm

Tonight Partly Cloudy	Thursday Mostly Cloudy	Thursday night Fog late	Friday Mostly Sunny	Friday night Fog late	Saturday Fog a.m.	Saturday night Fog	Sunday Rain likely
	<.1 in.						.75 in.
Low: 48°	High: 59°	Low: 50°	High: 68°	Low: 40°	High: 67°	Low: 56°	High: 61°

SSW 6 mph	NNW→E 2 mph	SE→SSW 6 mph	WSW 6-22 mph	N→ENE 2 mph	SE 6 mph	S 5 mph	SSW→NW 3→9-28 mph

Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Relatively mild. Low 48°. Wind south-southwest around 6 mph.
Thursday	Mostly cloudy. A chance of rain. Unusually mild. High 59°. Wind north-northwest around 2 mph in the morning, becoming east in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly cloudy. Light to moderate fog in the evening, then patchy light fog after midnight. Unusually mild. Low 50°. Wind southeast around 6 mph in the evening, becoming south-southwest after midnight.
Friday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Unusually mild. High 68°. Wind west-southwest around 6 mph, gusting to 22 mph.
Friday night	Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Relatively mild. Low 40°. Wind north around 2 mph in the evening, becoming east-northeast after midnight.
Saturday	Partly cloudy. Moderate fog in the morning. Unusually mild. High 67°. Wind southeast around 6 mph.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. Unusually mild. Low 56°. Wind south around 5 mph.
Sunday	Cloudy in the morning, becoming dense overcast in the afternoon. Light to moderate fog. A chance of rain in the morning, then rain likely in the afternoon. Unusually mild. High 61°, but temperatures falling in the afternoon. Wind south-southwest around 3 mph in the morning, becoming northwest around 9 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Sunday night	Dense overcast in the evening, becoming fair after midnight. A chance of rain. Breezy. Low 26°. Wind chill ranging from 18 to 42. Wind north-northwest around 14 mph, gusting to 32 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Monday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Breezy. High 30°. Wind chill ranging from 14 to 21. Wind north-northwest around 11 mph, gusting to 28 mph.
Monday night	Clear. Low 21°. Wind chill ranging from 14 to 20. Wind northwest around 6 mph, gusting to 24 mph.
Tuesday	Sunny in the morning, becoming partly cloudy in the afternoon. High 38°. Wind chill ranging from 15 to 32. Wind west around 6 mph, gusting to 23 mph.
Tuesday night	Clear in the evening, becoming fair after midnight. Low 23°. Wind southwest around 5 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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