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 05:00 am

Today Sunny	Tonight Partly Cloudy	Friday Sunny	Friday night Clear	Saturday Partly Cloudy	Saturday night Mostly Cloudy	Sunday Mostly Cloudy	Sunday night Fog late
					<.1 in.
High: 81°	Low: 52°	High: 86°	Low: 56°	High: 87°	Low: 61°	High: 81°	Low: 54°

SE 2-19 mph	SSE 3 mph	S 6-23 mph	S 5 mph	S 3-18→6-24 mph	SE→E 4-18 mph	NE→NNW 3-23 mph	ENE→S 2 mph
UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Today	Sunny. Warm. High 81°. UV index up to 5. Wind southeast around 2 mph, gusting to 19 mph.
Tonight	Clear in the evening, becoming fair to partly cloudy after midnight. Low 52°. Wind south-southeast around 3 mph.
Friday	Sunny. Unusually hot. High 86°. UV index up to 5. Wind south around 6 mph, gusting to 23 mph.
Friday night	Clear. Low 56°. Wind south around 5 mph.
Saturday	Partly cloudy. Unusually hot. High 87°. UV index up to 5. Wind south around 3 mph, gusting to 18 mph, in the morning, becoming 6 mph, gusting to 24 mph, in the afternoon.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain. Mild. Low 61°. Wind southeast around 4 mph, gusting to 18 mph, in the evening, becoming east after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Warm. High 81°. UV index up to 5. Wind northeast around 3 mph, gusting to 23 mph, in the morning, becoming north-northwest in the afternoon.
Sunday night	Clear. Patchy light fog after midnight. Low 54°. Wind east-northeast around 2 mph in the evening, becoming south after midnight.
Monday	Sunny. Patchy light fog in the morning. Unusually hot. High 86°. UV index up to 5. Wind south around 5 mph, gusting to 17 mph, in the morning, becoming 8 mph, gusting to 21 mph, in the afternoon.
Monday night	Clear in the evening, becoming fair after midnight. Low 61°. Wind south-southwest around 7 mph.
Tuesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Unusually hot. High 85°. UV index up to 4. Wind northwest around 6 mph, gusting to 25 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 52°. Wind north around 5 mph, gusting to 20 mph, in the evening, becoming east-northeast after midnight.
Wednesday	Sunny. Unusually hot. High 83°. UV index up to 4. Wind east-southeast around 7 mph, gusting to 23 mph, in the morning, becoming south-southeast around 10 mph, gusting to 28 mph, in the afternoon.
Wednesday night	Clear. Low 53°. Wind south-southeast around 10 mph, gusting to 19 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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