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: Sunday, 14-Dec-2025 05:00 am

Today Sunny Cold!	Tonight Clear Cold!	Monday Sunny	Monday night Partly Cloudy	Tuesday Mostly Sunny	Tuesday night Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Mostly Cloudy
							<.1 in.
High: 19°	Low: 7°	High: 41°	Low: 21°	High: 53°	Low: 28°	High: 57°	Low: 40°
WCh: -9°	WCh: -4°
NW 8-19→5-20 mph	ESE→S 2→6 mph	SSW 9-26 mph	SW 5 mph	SW 7-22 mph	SW 6 mph	SW→S 3-15 mph	S 8→11-17 mph

Today	Sunny. Cold. High 19°. Wind chill ranging from -9 to 14. Wind northwest around 8 mph, gusting to 19 mph, in the morning, becoming 5 mph, gusting to 20 mph, in the afternoon.
Tonight	Clear. Cold. Low 7°. Wind chill ranging from -4 to 12. Wind east-southeast around 2 mph in the evening, becoming south around 6 mph after midnight.
Monday	Sunny. High 41°. Wind south-southwest around 9 mph, gusting to 26 mph.
Monday night	Fair in the evening, becoming partly cloudy after midnight. Low 21°. Wind southwest around 5 mph.
Tuesday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Relatively mild. High 53°. Wind southwest around 7 mph, gusting to 22 mph.
Tuesday night	Partly cloudy. Low 28°. Wind southwest around 6 mph.
Wednesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 57°. Wind southwest around 3 mph, gusting to 15 mph, in the morning, becoming south in the afternoon.
Wednesday night	Mostly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain after midnight. Low 40°, but temperatures rising after midnight. Wind south around 8 mph in the evening, becoming 11 mph, gusting to 17 mph, after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Dense overcast in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Breezy. High 48°, but temperatures falling in the afternoon. Wind south-southwest around 14 mph, gusting to 28 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch.
Thursday night	Partly to mostly cloudy in the evening, becoming clear after midnight. Breezy. Low 23°. Wind chill ranging from 16 to 33. Wind west-northwest around 15 mph, gusting to 31 mph, in the evening, becoming 10 mph, gusting to 28 mph, after midnight.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 39°. Wind west-northwest around 4 mph, gusting to 23 mph, in the morning, becoming south in the afternoon.
Friday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 26°. Wind chill ranging from 16 to 30. Wind south-southeast around 9 mph, gusting to 19 mph.
Saturday	Mostly sunny in the morning, becoming mostly cloudy in the afternoon. Relatively mild. High 55°. Wind south-southeast around 9 mph, gusting to 23 mph, in the morning, becoming south-southwest in the afternoon.
Saturday night	Mostly cloudy to cloudy. Low 32°. Wind chill ranging from 24 to 48. Wind north-northwest around 5 mph in the evening, becoming 9 mph after midnight.

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