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, 25-Oct-2026 04:00 pm

Tonight Mostly Cloudy	Monday Partly Cloudy	Monday night Partly Cloudy	Tuesday Partly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Fog late	Thursday Fog a.m.

Low: 52°	High: 76°	Low: 51°	High: 75°	Low: 49°	High: 76°	Low: 51°	High: 78°

SE→SSW 3-16 mph	SSW 3-22 mph	SE→S 3 mph	S 5-23 mph	SE 4-15 mph	S 5-23 mph	SSW 6 mph	SW 6-21 mph

Tonight	Partly to mostly cloudy. Low 52°. Wind southeast around 3 mph, gusting to 16 mph, in the evening, becoming south-southwest after midnight.
Monday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. Wind south-southwest around 3 mph, gusting to 22 mph.
Monday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 51°. Wind southeast around 3 mph in the evening, becoming south after midnight.
Tuesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 75°. Wind south around 5 mph, gusting to 23 mph.
Tuesday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 49°. Wind southeast around 4 mph, gusting to 15 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Unusually warm. High 76°. Wind south around 5 mph, gusting to 23 mph.
Wednesday night	Clear. Patchy light fog after midnight. Low 51°. Wind south-southwest around 6 mph.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Unusually warm. High 78°. Wind southwest around 6 mph, gusting to 21 mph.
Thursday night	Mostly cloudy to cloudy. A chance of rain. Mild. Low 58°. Wind west around 2 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday	Mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. Mild. High 70°. Wind east-northeast around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Mostly cloudy to cloudy. A slight chance of rain. Mild. Low 57°. Wind east-northeast around 4 mph in the evening, becoming southeast after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Cloudy in the morning, becoming dense overcast in the afternoon. Mild. High 69°. Wind southeast around 5 mph, gusting to 18 mph.
Saturday night	Dense overcast. A chance of rain. Mild. Low 57°. Wind southeast near calm. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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