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: Wednesday, 07-Oct-2026 04:00 pm

Tonight Fog late	Thursday Fog a.m.	Thursday night Clear	Friday Sunny	Friday night Mostly Clear	Saturday Partly Cloudy	Saturday night Chance rain	Sunday Chance rain
						<.25 in.	<.1 in.
Low: 57°	High: 82°	Low: 54°	High: 85°	Low: 55°	High: 84°	Low: 60°	High: 79°

NNW 4-24 mph	E 2-21 mph	SE 3 mph	SSE 6-23 mph	SSE 5-15 mph	SSE 6-24 mph	ESE 4-16 mph	NE→N 4-23 mph
	UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Tonight	Clear. Patchy light fog after midnight. Low 57°. Wind north-northwest around 4 mph, gusting to 24 mph.
Thursday	Sunny. Patchy light fog in the morning. Unusually hot. High 82°. UV index up to 5. Wind east around 2 mph, gusting to 21 mph.
Thursday night	Clear. Low 54°. Wind southeast around 3 mph.
Friday	Sunny. Unusually hot. High 85°. UV index up to 5. Wind south-southeast around 6 mph, gusting to 23 mph.
Friday night	Clear in the evening, becoming mostly clear after midnight. Low 55°. Wind south-southeast around 5 mph, gusting to 15 mph.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Unusually hot. High 84°. UV index up to 5. Wind south-southeast around 6 mph, gusting to 24 mph.
Saturday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. A chance of rain after midnight. Low 60°. Wind east-southeast around 4 mph, gusting to 16 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday	Partly to mostly sunny. Moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Warm. High 79°. UV index up to 5. Wind northeast around 4 mph, gusting to 23 mph, in the morning, becoming north in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 56°. Wind south around 3 mph.
Monday	Sunny. Patchy light fog in the morning. Unusually hot. High 85°. UV index up to 5. Wind southwest around 6 mph, gusting to 20 mph.
Monday night	Clear. Low 59°. Wind southwest around 7 mph.
Tuesday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Warm. High 78°. Wind north-northwest around 5 mph, gusting to 20 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 53°. Wind east-northeast around 7 mph, gusting to 15 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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