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 05:00 am

Today Sunny	Tonight Clear	Tuesday Sunny	Tuesday night Clear	Wednesday Sunny	Wednesday night Clear	Thursday Sunny	Thursday night Partly Cloudy

High: 74°	Low: 45°	High: 77°	Low: 48°	High: 82°	Low: 50°	High: 79°	Low: 53°

NE 4-22 mph	ENE→SE 3 mph	SSE 4-23 mph	SSE→SSW 4 mph	WSW 6-22 mph	NNW 3 mph	NE 5-22 mph	ENE 4 mph
UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Today	Sunny. Warm. High 74°. UV index up to 5. Wind northeast around 4 mph, gusting to 22 mph.
Tonight	Clear. Low 45°. Wind east-northeast around 3 mph in the evening, becoming southeast after midnight.
Tuesday	Sunny. Warm. High 77°. UV index up to 5. Wind south-southeast around 4 mph, gusting to 23 mph.
Tuesday night	Clear. Low 48°. Wind south-southeast around 4 mph in the evening, becoming south-southwest after midnight.
Wednesday	Sunny. Unusually hot. High 82°. UV index up to 5. Wind west-southwest around 6 mph, gusting to 22 mph.
Wednesday night	Clear. Low 50°. Wind north-northwest around 3 mph.
Thursday	Sunny. Warm. High 79°. UV index up to 5. Wind northeast around 5 mph, gusting to 22 mph.
Thursday night	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Low 53°. Wind east-northeast around 4 mph.
Friday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Unusually hot. High 83°. UV index up to 5. Wind east-southeast around 5 mph, gusting to 24 mph, in the morning, becoming south-southeast in the afternoon.
Friday night	Clear. Low 54°. Wind south-southeast around 5 mph.
Saturday	Sunny in the morning, becoming partly cloudy in the afternoon. Unusually hot. High 85°. UV index up to 5. Wind south-southeast around 4 mph, gusting to 17 mph, in the morning, becoming 8 mph, gusting to 23 mph, in the afternoon.
Saturday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Mild. Low 62°. Wind south-southeast around 6 mph, gusting to 15 mph.
Sunday	Dense overcast. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. High 68°. Wind east-southeast around 4 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Sunday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. Low 60°. Wind north-northeast around 3 mph, gusting to 15 mph, in the evening, becoming north-northwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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