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-Nov-2026 04:00 pm

Tonight Fog late	Thursday Fog a.m.	Thursday night Partly Cloudy	Friday Fog a.m.	Friday night Clear	Saturday Sunny	Saturday night Partly Cloudy	Sunday Partly Cloudy

Low: 39°	High: 52°	Low: 31°	High: 45°	Low: 27°	High: 50°	Low: 28°	High: 52°

WNW 9-27→5 mph	NW 10-28 mph	NNW 7-24 mph	NNW 8-25 mph	NNW 4-20 mph	NW 2-21 mph	NE calm	E 2-20 mph

Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. Low 39°. Wind west-northwest around 9 mph, gusting to 27 mph, in the evening, becoming 5 mph after midnight.
Thursday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. High 52°. Wind northwest around 10 mph, gusting to 28 mph.
Thursday night	Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 31°. Wind north-northwest around 7 mph, gusting to 24 mph.
Friday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 45°. Wind north-northwest around 8 mph, gusting to 25 mph.
Friday night	Fair in the evening, becoming clear after midnight. Low 27°. Wind north-northwest around 4 mph, gusting to 20 mph.
Saturday	Sunny. High 50°. Wind northwest around 2 mph, gusting to 21 mph.
Saturday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 28°. Wind northeast near calm.
Sunday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 52°. Wind east around 2 mph, gusting to 20 mph.
Sunday night	Mostly clear in the evening, becoming clear after midnight. Low 28°. Wind east near calm in the evening, becoming southeast after midnight.
Monday	Sunny. High 55°. Wind southeast around 2 mph, gusting to 21 mph.
Monday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 29°. Wind southeast around 3 mph.
Tuesday	Sunny. High 57°. Wind southeast around 3 mph, gusting to 22 mph.
Tuesday night	Clear. Patchy light fog after midnight. Low 31°. Wind southeast around 3 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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