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: Sunday, 04-Oct-2026 05:00 am

Today Sunny	Tonight Clear	Monday Fog a.m.	Monday night Clear	Tuesday Sunny	Tuesday night Clear	Wednesday Sunny	Wednesday night Clear

High: 75°	Low: 46°	High: 74°	Low: 46°	High: 77°	Low: 48°	High: 82°	Low: 49°

NNW 2-17→6-21 mph	NNW 4 mph	NE 4-23 mph	NE→ESE 2 mph	SSE 4-23 mph	S→SW 3 mph	WNW 5-23 mph	NNW 3 mph
UV: 6 High		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Today	Sunny. Warm. High 75°. UV index up to 6. Wind north-northwest around 2 mph, gusting to 17 mph, in the morning, becoming 6 mph, gusting to 21 mph, in the afternoon.
Tonight	Clear. Low 46°. Wind north-northwest around 4 mph.
Monday	Sunny. Patchy light fog in the morning. Warm. High 74°. UV index up to 5. Wind northeast around 4 mph, gusting to 23 mph.
Monday night	Clear. Low 46°. Wind northeast around 2 mph in the evening, becoming east-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 around 3 mph in the evening, becoming southwest after midnight.
Wednesday	Sunny. Warm. High 82°. UV index up to 5. Wind west-northwest around 5 mph, gusting to 23 mph.
Wednesday night	Clear. Low 49°. Wind north-northwest around 3 mph.
Thursday	Sunny. Warm. High 79°. UV index up to 5. Wind east around 5 mph, gusting to 23 mph.
Thursday night	Clear in the evening, becoming mostly clear after midnight. Low 51°. Wind southeast around 5 mph.
Friday	Sunny in the morning, becoming mostly sunny in the afternoon. Unusually hot. High 83°. UV index up to 5. Wind southeast around 4 mph, gusting to 21 mph.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 54°. Wind southeast around 4 mph.
Saturday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Unusually hot. High 84°. Wind south-southeast around 6 mph, gusting to 20 mph, in the morning, becoming 11 mph, gusting to 26 mph, in the afternoon.
Saturday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Warm. Low 67°. Wind south-southeast around 10 mph, gusting to 25 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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