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: Monday, 26-Oct-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Clear	Thursday Mostly Cloudy	Thursday night Chance rain
							<.1 in.
High: 78°	Low: 52°	High: 76°	Low: 53°	High: 78°	Low: 50°	High: 78°	Low: 57°

SSW 2-21 mph	SE→S 3 mph	S 4-23 mph	SSE 4-17 mph	S 5-23 mph	S 5 mph	SSW 6-22 mph	SW→SSE calm

Today	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Unusually warm. High 78°. Wind south-southwest around 2 mph, gusting to 21 mph.
Tonight	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 52°. Wind southeast around 3 mph in the evening, becoming south after midnight.
Tuesday	Partly to mostly cloudy. Unusually warm. High 76°. Wind south around 4 mph, gusting to 23 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 53°. Wind south-southeast around 4 mph, gusting to 17 mph.
Wednesday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Unusually warm. High 78°. Wind south around 5 mph, gusting to 23 mph.
Wednesday night	Clear. Low 50°. Wind south around 5 mph.
Thursday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Unusually warm. High 78°. Wind south-southwest around 6 mph, gusting to 22 mph.
Thursday night	Mostly cloudy. A chance of rain. Mild. Low 57°. Wind southwest near calm in the evening, becoming south-southeast after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Friday	Partly to mostly cloudy. A slight chance of rain. Unusually warm. High 76°. Wind south-southeast around 2 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Mild. Low 56°. Wind south-southeast around 4 mph.
Saturday	Mostly cloudy to cloudy. A slight chance of rain. Mild. High 72°. Wind south-southeast around 2 mph, gusting to 16 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain. Mild. Low 61°. Wind east-southeast around 2 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday	Cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. Mild. High 69°. Wind north-northwest around 1 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Cloudy. Patchy light fog after midnight. A chance of rain. Mild. Low 60°. Wind north-northeast around 2 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

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