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: Saturday, 13-Dec-2025 05:00 am

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

High: 31°	Low: 12°	High: 24°	Low: 12°	High: 43°	Low: 22°	High: 54°	Low: 28°
WCh: 19°	WCh: 2°		WCh: 2°
N 6-25 mph	N 8-25 mph	N 8-24→5-23 mph	ESE→SSE 2→6 mph	SSW 9-25 mph	SW 4 mph	SW 5→8-22 mph	WSW 6 mph

Today	Cloudy in the morning, becoming dense overcast in the afternoon. High 31°. Wind chill ranging from 19 to 24. Wind north around 6 mph, gusting to 25 mph.
Tonight	Mostly cloudy in the evening, becoming clear after midnight. Cold. Low 12°. Wind chill ranging from 2 to 18. Wind north around 8 mph, gusting to 25 mph.
Sunday	Sunny. Cold. High 24°. Wind north around 8 mph, gusting to 24 mph, in the morning, becoming 5 mph, gusting to 23 mph, in the afternoon.
Sunday night	Clear. Cold. Low 12°. Wind chill ranging from 2 to 18. Wind east-southeast around 2 mph in the evening, becoming south-southeast around 6 mph after midnight.
Monday	Sunny. High 43°. Wind south-southwest around 9 mph, gusting to 25 mph.
Monday night	Mostly clear in the evening, becoming fair after midnight. Low 22°. Wind southwest around 4 mph.
Tuesday	Sunny. Relatively mild. High 54°. Wind southwest around 5 mph in the morning, becoming 8 mph, gusting to 22 mph, in the afternoon.
Tuesday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 28°. Wind west-southwest around 6 mph.
Wednesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 52°. Wind west around 3 mph in the morning, becoming east-northeast in the afternoon.
Wednesday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain. Low 36°, but temperatures rising after midnight. Wind southeast around 7 mph in the evening, becoming 11 mph, gusting to 16 mph, after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Dense overcast in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Breezy and relatively mild. High 53°. Wind south around 12 mph, gusting to 24 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Thursday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 25°. Wind west-northwest around 12 mph, gusting to 26 mph, in the evening, becoming 7 mph after midnight.
Friday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 45°. Wind north-northwest around 3 mph in the morning, becoming southeast around 7 mph, gusting to 19 mph, in the afternoon.
Friday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 29°. Wind chill ranging from 22 to 32. Wind southeast around 8 mph, gusting to 15 mph.

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