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: Wednesday, 11-Feb-2026 04:00 pm

Tonight Mostly Cloudy	Thursday Partly Cloudy	Thursday night Partly Cloudy	Friday Mostly Sunny	Friday night Partly Cloudy	Saturday Rain likely	Saturday night Rain likely	Sunday Fog a.m.
					.35 in.	.35 in.
Low: 28°	High: 55°	Low: 31°	High: 61°	Low: 34°	High: 53°	Low: 43°	High: 61°

N→SE calm	SE 3-18→7-24 mph	SE 5-20 mph	SSE 5-23 mph	ESE→S calm	SE 3 mph	ESE→NE 5-15 mph	NNE 6-23 mph

Tonight	Clear in the evening, becoming partly to mostly cloudy after midnight. Low 28°. Wind north near calm in the evening, becoming southeast after midnight.
Thursday	Partly cloudy. Relatively mild. High 55°. Wind southeast around 3 mph, gusting to 18 mph, in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon.
Thursday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 31°. Wind southeast around 5 mph, gusting to 20 mph.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 61°. Wind south-southeast around 5 mph, gusting to 23 mph.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 34°. Wind east-southeast near calm in the evening, becoming south after midnight.
Saturday	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. Relatively mild. High 53°. Wind southeast around 3 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Saturday night	Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog. Rain likely in the evening, then a chance of rain after midnight. Relatively mild. Low 43°. Wind east-southeast around 5 mph, gusting to 15 mph, in the evening, becoming northeast after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Sunday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Mild. High 61°. Wind north-northeast around 6 mph, gusting to 23 mph.
Sunday night	Clear. Low 34°. Wind northwest around 3 mph, gusting to 17 mph, in the evening, becoming west-southwest after midnight.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually mild. High 64°. Wind south-southwest around 5 mph, gusting to 22 mph.
Monday night	Partly cloudy. Patchy light fog after midnight. Low 40°. Wind south-southeast around 6 mph, gusting to 16 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Unusually mild. High 65°. Wind south-southeast around 7 mph, gusting to 18 mph, in the morning, becoming 13 mph, gusting to 30 mph, in the afternoon.
Tuesday night	Clear in the evening, becoming fair after midnight. Windy and relatively mild. Low 46°. Wind south-southwest around 17 mph, gusting to 27 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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