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, 27-Dec-2025 04:00 pm

Tonight Mostly Cloudy	Sunday Chance rain	Sunday night Mostly Cloudy	Monday Mostly Sunny	Monday night Clear	Tuesday Mostly Sunny	Tuesday night Partly Cloudy	Wednesday Partly Cloudy
	<.1 in.
Low: 52°	High: 68°	Low: 19°	High: 21°	Low: 13°	High: 37°	Low: 22°	High: 47°
		WCh: 9°	WCh: 3°		WCh: 4°	WCh: 15°
SSE→SSW 8 mph	SSW→W 9-20→15-32 mph	WNW 17-34 mph	WNW 16-32 mph	WNW 10-21 mph	WNW 7-24 mph	WSW 7-18 mph	W 6-24 mph

Tonight	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Unusually mild. Low 52°, but temperatures rising after midnight. Wind south-southeast around 8 mph in the evening, becoming south-southwest after midnight.
Sunday	Cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Breezy and unusually mild. High 68°. Wind south-southwest around 9 mph, gusting to 20 mph, in the morning, becoming west around 15 mph, gusting to 32 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Mostly cloudy in the evening, becoming fair after midnight. Windy. Low 19°. Wind chill ranging from 9 to 46. Wind west-northwest around 17 mph, gusting to 34 mph.
Monday	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Breezy and cold. High 21°. Wind chill ranging from 3 to 8. Wind west-northwest around 16 mph, gusting to 32 mph.
Monday night	Clear. Cold. Low 13°. Wind chill as low as 1. Wind west-northwest around 10 mph, gusting to 21 mph.
Tuesday	Sunny in the morning, becoming mostly sunny in the afternoon. High 37°. Wind chill ranging from 4 to 31. Wind west-northwest around 7 mph, gusting to 24 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 22°. Wind chill ranging from 15 to 28. Wind west-southwest around 7 mph, gusting to 18 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Relatively mild. High 47°. Wind west around 6 mph, gusting to 24 mph.
Wednesday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 26°. Wind west-southwest around 4 mph.
Thursday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 39°. Wind north around 6 mph, gusting to 26 mph.
Thursday night	Fair in the evening, becoming clear after midnight. Low 19°. Wind north around 2 mph, gusting to 20 mph, in the evening, becoming west-northwest after midnight.
Friday	Sunny. High 42°. Wind east-southeast around 2 mph, gusting to 22 mph.
Friday night	Partly to mostly cloudy. Low 27°. Wind chill ranging from 20 to 35. Wind southeast around 6 mph, gusting to 19 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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