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 04:00 pm

Tonight Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Clear	Thursday Partly Cloudy	Thursday night Mostly Cloudy	Friday Mostly Cloudy

Low: 52°	High: 74°	Low: 54°	High: 75°	Low: 48°	High: 78°	Low: 54°	High: 74°

SE→S 3-17 mph	S 4-22 mph	SSE 4-17 mph	S 5-21 mph	S 6 mph	S→WSW 6-22 mph	NNW→NE 2 mph	ESE 4-17 mph

Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 52°. Wind southeast around 3 mph, gusting to 17 mph, in the evening, becoming south after midnight.
Tuesday	Partly to mostly cloudy. Warm. High 74°. Wind south around 4 mph, gusting to 22 mph.
Tuesday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 54°. Wind south-southeast around 4 mph, gusting to 17 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 75°. Wind south around 5 mph, gusting to 21 mph.
Wednesday night	Clear. Low 48°. Wind south around 6 mph.
Thursday	Sunny in the morning, becoming partly cloudy in the afternoon. Unusually warm. High 78°. Wind south around 6 mph, gusting to 22 mph, in the morning, becoming west-southwest in the afternoon.
Thursday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 54°. Wind north-northwest around 2 mph in the evening, becoming northeast after midnight.
Friday	Mostly cloudy. Warm. High 74°. Wind east-southeast around 4 mph, gusting to 17 mph.
Friday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 53°. Wind south-southeast around 3 mph.
Saturday	Mostly cloudy to cloudy. A chance of rain. Mild. High 70°. Wind southeast around 4 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Mild. Low 59°. Wind east-southeast around 6 mph, gusting to 15 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Sunday	Mostly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Mild. High 72°. Wind northwest around 5 mph, gusting to 22 mph.
Sunday night	Cloudy. Mild. Low 57°. Wind north around 3 mph, gusting to 15 mph, in the evening, becoming east-northeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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