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: Friday, 06-Feb-2026 05:00 am

Today Mostly Cloudy	Tonight Partly Cloudy	Saturday Partly Cloudy	Saturday night Partly Cloudy	Sunday Partly Cloudy	Sunday night Clear	Monday Sunny	Monday night Clear

High: 56°	Low: 31°	High: 48°	Low: 24°	High: 55°	Low: 27°	High: 69°	Low: 37°
			WCh: 18°
NW 12-31 mph	NW 9-28→5-23 mph	NE→ESE 3-25 mph	SE 7-23 mph	SSE 6-22 mph	ESE→WSW 2-17 mph	WSW 5-21 mph	S 4 mph

Today	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Breezy and relatively mild. High 56°. Wind northwest around 12 mph, gusting to 31 mph.
Tonight	Partly cloudy. Low 31°. Wind northwest around 9 mph, gusting to 28 mph, in the evening, becoming 5 mph, gusting to 23 mph, after midnight.
Saturday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 48°. Wind northeast around 3 mph, gusting to 25 mph, in the morning, becoming east-southeast in the afternoon.
Saturday night	Partly cloudy. Low 24°. Wind chill ranging from 18 to 41. Wind southeast around 7 mph, gusting to 23 mph.
Sunday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 55°. Wind south-southeast around 6 mph, gusting to 22 mph.
Sunday night	Clear. Low 27°. Wind east-southeast around 2 mph, gusting to 17 mph, in the evening, becoming west-southwest after midnight.
Monday	Sunny. Unusually warm. High 69°. Wind west-southwest around 5 mph, gusting to 21 mph.
Monday night	Clear in the evening, becoming fair after midnight. Low 37°. Wind south around 4 mph.
Tuesday	Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. Precipitation showery or intermittent. Unusually mild. High 61°. Wind south around 4 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Relatively mild. Low 41°. Wind southwest around 6 mph in the evening, becoming west-northwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Unusually mild. High 61°. Wind north around 6 mph, gusting to 24 mph.
Wednesday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 33°. Wind north around 5 mph, gusting to 21 mph.
Thursday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 47°. Wind north around 8 mph, gusting to 27 mph.
Thursday night	Partly to mostly cloudy. Low 29°. Wind north around 3 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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