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, 22-Feb-2026 05:00 am

Today Mostly Sunny	Tonight Clear	Monday Mostly Sunny	Monday night Partly Cloudy	Tuesday Partly Cloudy	Tuesday night Partly Cloudy	Wednesday Mostly Cloudy	Wednesday night Chance rain
							<.25 in.
High: 31°	Low: 14°	High: 35°	Low: 17°	High: 50°	Low: 26°	High: 56°	Low: 39°
WCh: 9°	WCh: 3°		WCh: 10°
WNW 14-31 mph	WNW 12-27 mph	WNW 9-26 mph	WNW→S 3-20 mph	S 9-20→12-23 mph	W 8-18 mph	W→SSE 3-21 mph	SE 7-21 mph

Today	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Breezy and cold. High 31°. Wind chill ranging from 9 to 20. Wind west-northwest around 14 mph, gusting to 31 mph.
Tonight	Clear in the evening, becoming fair after midnight. Breezy and cold. Low 14°. Wind chill ranging from 3 to 19. Wind west-northwest around 12 mph, gusting to 27 mph.
Monday	Mostly sunny in the morning, becoming sunny in the afternoon. High 35°. Wind west-northwest around 9 mph, gusting to 26 mph.
Monday night	Fair in the evening, becoming partly cloudy after midnight. Cold. Low 17°. Wind chill ranging from 10 to 30. Wind west-northwest around 3 mph, gusting to 20 mph, in the evening, becoming south after midnight.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 50°. Wind south around 9 mph, gusting to 20 mph, in the morning, becoming 12 mph, gusting to 23 mph, in the afternoon.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Low 26°. Wind west around 8 mph, gusting to 18 mph.
Wednesday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 56°. Wind west around 3 mph, gusting to 21 mph, in the morning, becoming south-southeast in the afternoon.
Wednesday night	Mostly cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 39°. Wind southeast around 7 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Thursday	Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain. Breezy. High 49°. Wind west around 12 mph, gusting to 28 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Clear. Low 27°. Wind northwest around 4 mph, gusting to 23 mph, in the evening, becoming south-southwest after midnight.
Friday	Sunny. Patchy light fog in the morning. Mild. High 60°. Wind south around 6 mph, gusting to 16 mph, in the morning, becoming 11 mph, gusting to 24 mph, in the afternoon.
Friday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 33°. Wind south around 10 mph, gusting to 17 mph.
Saturday	Sunny. Breezy and unusually mild. High 68°. UV index up to 4. Wind south-southwest around 12 mph, gusting to 30 mph.
Saturday night	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 36°. Wind southwest around 5 mph, gusting to 19 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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