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: Saturday, 07-Mar-2026 03:00 pm

Tonight Partly Cloudy	Sunday Mostly Sunny	Sunday night Fair	Monday Mostly Sunny	Monday night Mostly Clear	Tuesday Thunder storm	Tuesday night Thunder storm	Wednesday Thunder storm
					.35 in.	1.0 in.	.75 in.
Low: 38°	High: 67°	Low: 42°	High: 80°	Low: 55°	High: 81°	Low: 62°	High: 64°

WNW 5 mph	WSW 8-26 mph	WSW 7-20 mph	SSW 8-24→11-28 mph	SSW 8-21 mph	SSW 8-23→12-28 mph	SSW 12-27 mph	W 14-33 mph
	UV: 5 Medium		UV: 4 Medium

Tonight	Partly cloudy in the evening, becoming fair after midnight. Low 38°. Wind west-northwest around 5 mph.
Sunday	Mostly sunny. Mild. High 67°. UV index up to 5. Wind west-southwest around 8 mph, gusting to 26 mph.
Sunday night	Fair. Low 42°. Wind west-southwest around 7 mph, gusting to 20 mph.
Monday	Mostly sunny in the morning, becoming sunny in the afternoon. Exceptionally hot. High 80°. UV index up to 4. Wind south-southwest around 8 mph, gusting to 24 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon.
Monday night	Mostly clear in the evening, becoming fair after midnight. Relatively mild. Low 55°. Wind south-southwest around 8 mph, gusting to 21 mph.
Tuesday	Mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some severe. Exceptionally hot. High 81°. Wind south-southwest around 8 mph, gusting to 23 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Tuesday night	Cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. Rain very likely. Thunderstorms very likely, some severe. Breezy and unusually warm. Low 62°. Wind south-southwest around 12 mph, gusting to 27 mph. Chance of precipitation 90 percent. Precipitation mostly around an inch.
Wednesday	Dense overcast in the morning, becoming cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely in the morning, then a slight chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Breezy and mild. High 64°, but temperatures falling in the afternoon. Wind west around 14 mph, gusting to 33 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Wednesday night	Partly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Low 35°. Wind west-northwest around 10 mph, gusting to 29 mph.
Thursday	Sunny. Moderate fog in the morning, then patchy light fog in the afternoon. High 53°. Wind west-southwest around 7 mph, gusting to 16 mph, in the morning, becoming 11 mph, gusting to 24 mph, in the afternoon.
Thursday night	Fair. Breezy. Low 42°. Wind west-southwest around 14 mph, gusting to 22 mph.
Friday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Breezy and mild. High 65°. Wind west-southwest around 13 mph, gusting to 29 mph.
Friday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 39°. Wind north around 7 mph, gusting to 18 mph.

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