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: Monday, 22-Dec-2025 04:00 pm

Tonight Partly Cloudy	Tuesday Mostly Sunny	Tuesday night Partly Cloudy	Wednesday Cloudy	Wednesday night Fog	Thursday Mostly Cloudy	Thursday night Fog	Friday Mostly Sunny
			<.1 in.	<.1 in.
Low: 39°	High: 65°	Low: 37°	High: 57°	Low: 47°	High: 58°	Low: 47°	High: 65°

S 7-16 mph	SW→WNW 5-19 mph	NNE→E 2 mph	SSE 5 mph	SSW→WSW 4 mph	NNE→ESE 3 mph	SSE→SSW 7 mph	SW→W 5 mph

Tonight	Fair to partly cloudy. Relatively mild. Low 39°. Wind south around 7 mph, gusting to 16 mph.
Tuesday	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Unusually mild. High 65°. Wind southwest around 5 mph, gusting to 19 mph, in the morning, becoming west-northwest in the afternoon.
Tuesday night	Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Relatively mild. Low 37°. Wind north-northeast around 2 mph in the evening, becoming east after midnight.
Wednesday	Cloudy. A chance of rain. Unusually mild. High 57°. Wind south-southeast around 5 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Partly to mostly cloudy. Patchy light fog. A slight chance of rain. Relatively mild. Low 47°. Wind south-southwest around 4 mph in the evening, becoming west-southwest after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Unusually mild. High 58°. Wind north-northeast around 3 mph in the morning, becoming east-southeast in the afternoon.
Thursday night	Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog. Relatively mild. Low 47°. Wind south-southeast around 7 mph in the evening, becoming south-southwest after midnight.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually mild. High 65°. Wind southwest around 5 mph in the morning, becoming west in the afternoon.
Friday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Moderate fog. Relatively mild. Low 46°. Wind north-northeast around 2 mph in the evening, becoming southeast after midnight.
Saturday	Partly cloudy. Moderate fog in the morning, then light to moderate fog in the afternoon. Unusually mild. High 64°. Wind south-southwest around 6 mph.
Saturday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 36°. Wind west-northwest around 9 mph, gusting to 25 mph.
Sunday	Partly cloudy. High 45°. Wind northwest around 10 mph, gusting to 27 mph.
Sunday night	Clear in the evening, becoming mostly clear after midnight. Low 22°. Wind chill ranging from 16 to 35. Wind northwest around 7 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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