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, 05-Oct-2026 04:00 pm

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

Low: 47°	High: 79°	Low: 49°	High: 83°	Low: 53°	High: 81°	Low: 51°	High: 82°

ENE→ESE 3-19 mph	SSE 4-23 mph	S 4 mph	WSW 6-22 mph	NW 2 mph	NE 3-21 mph	ENE 4 mph	SE 4-18→7-23 mph
	UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 4 Medium

Tonight	Clear. Low 47°. Wind east-northeast around 3 mph, gusting to 19 mph, in the evening, becoming east-southeast after midnight.
Tuesday	Sunny. Warm. High 79°. UV index up to 5. Wind south-southeast around 4 mph, gusting to 23 mph.
Tuesday night	Clear. Low 49°. Wind south around 4 mph.
Wednesday	Sunny. Unusually hot. High 83°. UV index up to 5. Wind west-southwest around 6 mph, gusting to 22 mph.
Wednesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 53°. Wind northwest around 2 mph.
Thursday	Sunny. Warm. High 81°. UV index up to 5. Wind northeast around 3 mph, gusting to 21 mph.
Thursday night	Clear in the evening, becoming mostly clear after midnight. Low 51°. Wind east-northeast around 4 mph.
Friday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 82°. UV index up to 4. Wind southeast around 4 mph, gusting to 18 mph, in the morning, becoming 7 mph, gusting to 23 mph, in the afternoon.
Friday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 56°. Wind south-southeast around 6 mph, gusting to 15 mph.
Saturday	Partly cloudy. Unusually hot. High 85°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 18 mph, in the morning, becoming 8 mph, gusting to 24 mph, in the afternoon.
Saturday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain after midnight. Low 62°. Wind southeast around 5 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Warm. High 80°. Wind north around 5 mph, gusting to 25 mph.
Sunday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 56°. Wind south around 2 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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