OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CDT UTC Last station update CDT

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Sunday, 15-Mar-2026 05:00 am

Today Thunder storm	Tonight Rain and Snow	Monday Snow	Monday night Partly Cloudy	Tuesday Partly Cloudy	Tuesday night Mostly Cloudy	Wednesday Mostly Sunny	Wednesday night Partly Cloudy
.35 in.	<.25 in.	<.1 in.
High: 72°	Low: 27°	High: 29°	Low: 13°	High: 40°	Low: 31°	High: 65°	Low: 39°
	WCh: 20°	WCh: 8°	WCh: 3°		WCh: 23°
SSW 15-34 mph	WNW 17-35 mph	WNW 17-34 mph	WNW 10-26 mph	NW→SW 5-23 mph	SE 6-23→9-20 mph	S→SW 8-26 mph	SSW 4-18 mph
						UV: 5 Medium

Today	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. Breezy and mild. High 72°. Wind south-southwest around 15 mph, gusting to 34 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Tonight	Cloudy. Patchy light fog in the evening. A chance of rain in the evening, then a slight chance of a mix of rain and snow after midnight. Windy and cold. Low 27°. Wind chill ranging from 20 to 54. Wind west-northwest around 17 mph, gusting to 35 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. No snow accumulation expected.
Monday	Dense overcast in the morning, becoming cloudy in the afternoon. A slight chance of snow. Windy and very cold. High 29°, but temperatures falling in the afternoon. Wind chill ranging from 8 to 19. Wind west-northwest around 17 mph, gusting to 34 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Monday night	Fair to partly cloudy in the evening, becoming clear after midnight. Very cold. Low 13°. Wind chill ranging from 3 to 9. Wind west-northwest around 10 mph, gusting to 26 mph.
Tuesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Cold. High 40°. Wind northwest around 5 mph, gusting to 23 mph, in the morning, becoming southwest in the afternoon.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Cold. Low 31°. Wind chill ranging from 23 to 37. Wind southeast around 6 mph, gusting to 23 mph, in the evening, becoming 9 mph, gusting to 20 mph, after midnight.
Wednesday	Mostly sunny. Mild. High 65°. UV index up to 5. Wind south around 8 mph, gusting to 26 mph, in the morning, becoming southwest in the afternoon.
Wednesday night	Partly cloudy. Low 39°. Wind south-southwest around 4 mph, gusting to 18 mph.
Thursday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Mild. High 68°. UV index up to 5. Wind north-northwest around 5 mph, gusting to 22 mph.
Thursday night	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Low 38°. Wind north around 3 mph, gusting to 17 mph, in the evening, becoming southeast after midnight.
Friday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Unusually warm. High 75°. UV index up to 5. Wind south around 5 mph, gusting to 18 mph, in the morning, becoming southwest around 9 mph, gusting to 25 mph, in the afternoon.
Friday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 42°. Wind southwest around 4 mph, gusting to 17 mph.
Saturday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Exceptionally hot. High 84°. UV index up to 6. Wind west-northwest around 4 mph, gusting to 22 mph.
Saturday night	Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 46°. Wind south around 3 mph.

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