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: Thursday, 08-Oct-2026 04:00 pm

Tonight Clear	Friday Sunny	Friday night Clear	Saturday Partly Cloudy	Saturday night Partly Cloudy	Sunday Sunny	Sunday night Partly Cloudy	Monday Mostly Sunny

Low: 54°	High: 86°	Low: 53°	High: 83°	Low: 56°	High: 82°	Low: 56°	High: 88°

SSE 3-18 mph	SSE 6-25 mph	SSE 5 mph	SSE 4-22 mph	ESE 3-17 mph	NNW 2-20 mph	SE→SSW 3 mph	SW 7-24 mph
	UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Tonight	Clear. Low 54°. Wind south-southeast around 3 mph, gusting to 18 mph.
Friday	Sunny. Unusually hot. High 86°. UV index up to 5. Wind south-southeast around 6 mph, gusting to 25 mph.
Friday night	Clear. Low 53°. Wind south-southeast around 5 mph.
Saturday	Partly cloudy. Unusually hot. High 83°. UV index up to 5. Wind south-southeast around 4 mph, gusting to 22 mph.
Saturday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 56°. Wind east-southeast around 3 mph, gusting to 17 mph.
Sunday	Sunny. Unusually hot. High 82°. UV index up to 5. Wind north-northwest around 2 mph, gusting to 20 mph.
Sunday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 56°. Wind southeast around 3 mph in the evening, becoming south-southwest after midnight.
Monday	Mostly sunny in the morning, becoming sunny in the afternoon. Unusually hot. High 88°. UV index up to 5. Wind southwest around 7 mph, gusting to 24 mph.
Monday night	Clear. Low 60°. Wind southwest around 5 mph.
Tuesday	Sunny in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain in the afternoon. Precipitation showery or intermittent. Unusually hot. High 90°. UV index up to 5. Wind southwest around 4 mph, gusting to 22 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Tuesday night	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Mild. Low 61°. Wind northeast around 4 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Wednesday	Mostly cloudy. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. Warm. High 77°. Wind southeast around 7 mph, gusting to 16 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Wednesday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain. Precipitation showery or intermittent. Mild. Low 64°. Wind south around 7 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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