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, 26-Dec-2025 05:00 am

Today Mostly Sunny	Tonight Partly Cloudy	Saturday Partly Cloudy	Saturday night Mostly Cloudy	Sunday Rain likely	Sunday night Chance rain	Monday Partly Cloudy	Monday night Mostly Clear
			<.1 in.	<.25 in.	<.1 in.
High: 72°	Low: 46°	High: 71°	Low: 60°	High: 67°	Low: 25°	High: 27°	Low: 16°
					WCh: 17°	WCh: 11°	WCh: 5°
W 7-25 mph	N→E 2 mph	ESE 5-17→9-24 mph	SSE 7-18 mph	S→WSW 8-20→12-24 mph	W 16-34 mph	W 15-32 mph	WNW 11-25 mph

Today	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Exceptionally warm. High 72°. Wind west around 7 mph, gusting to 25 mph.
Tonight	Fair in the evening, becoming partly cloudy after midnight. Relatively mild. Low 46°. Wind north around 2 mph in the evening, becoming east after midnight.
Saturday	Partly cloudy. Exceptionally warm. High 71°. Wind east-southeast around 5 mph, gusting to 17 mph, in the morning, becoming 9 mph, gusting to 24 mph, in the afternoon.
Saturday night	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain. Unusually mild. Low 60°. Wind south-southeast around 7 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the afternoon. Rain likely. Precipitation showery or intermittent. Unusually mild. High 67°. Wind south around 8 mph, gusting to 20 mph, in the morning, becoming west-southwest around 12 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Sunday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Windy. Low 25°. Wind chill ranging from 17 to 50. Wind west around 16 mph, gusting to 34 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Monday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Breezy. High 27°. Wind chill ranging from 11 to 16. Wind west around 15 mph, gusting to 32 mph.
Monday night	Clear in the evening, becoming mostly clear after midnight. Cold. Low 16°. Wind chill ranging from 5 to 12. Wind west-northwest around 11 mph, gusting to 25 mph.
Tuesday	Sunny. High 38°. Wind chill ranging from 6 to 31. Wind northwest around 7 mph, gusting to 24 mph, in the morning, becoming west in the afternoon.
Tuesday night	Partly cloudy. Low 24°. Wind chill ranging from 18 to 29. Wind west around 7 mph, gusting to 19 mph.
Wednesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 47°. Wind west around 5 mph, gusting to 21 mph.
Wednesday night	Fair in the evening, becoming partly cloudy after midnight. Low 25°. Wind west around 4 mph, gusting to 17 mph.
Thursday	Mostly cloudy in the morning, becoming mostly sunny in the afternoon. High 33°. Wind chill ranging from 14 to 25. Wind north around 11 mph, gusting to 29 mph.
Thursday night	Clear. Low 18°. Wind north around 5 mph, gusting to 23 mph.

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