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, 13-Oct-2025 04:00 pm

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

Low: 57°	High: 82°	Low: 54°	High: 82°	Low: 51°	High: 82°	Low: 54°	High: 83°

ESE 2-15 mph	SE 3-23 mph	SE 2 mph	ESE 2-21 mph	ESE 3 mph	SE 4-22→8-25 mph	SE 6-17 mph	SSE 6-24 mph
	UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Tonight	Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog. Low 57°. Wind east-southeast around 2 mph, gusting to 15 mph.
Tuesday	Mostly sunny in the morning, becoming sunny in the afternoon. Unusually hot. High 82°. UV index up to 5. Wind southeast around 3 mph, gusting to 23 mph.
Tuesday night	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Low 54°. Wind southeast around 2 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Unusually hot. High 82°. UV index up to 5. Wind east-southeast around 2 mph, gusting to 21 mph.
Wednesday night	Mostly clear. Low 51°. Wind east-southeast around 3 mph.
Thursday	Sunny. Unusually hot. High 82°. UV index up to 5. Wind southeast around 4 mph, gusting to 22 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon.
Thursday night	Partly cloudy. Low 54°. Wind southeast around 6 mph, gusting to 17 mph.
Friday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Unusually hot. High 83°. Wind south-southeast around 6 mph, gusting to 24 mph.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. A slight chance of rain after midnight. Mild. Low 60°. Wind south around 7 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning, then moderate fog in the afternoon. Rain likely. Precipitation showery or intermittent. High 70°. Wind southwest around 6 mph, gusting to 17 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Saturday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 59°. Wind west around 4 mph, gusting to 17 mph, in the evening, becoming 9 mph, gusting to 25 mph, after midnight. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch.
Sunday	Sunny. Breezy. High 68°. Wind west around 12 mph, gusting to 29 mph.
Sunday night	Clear. Low 45°. Wind west around 4 mph, gusting to 20 mph, in the evening, becoming southwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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