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 04:00 pm

Tonight Fog late	Monday Fog a.m.	Monday night Clear	Tuesday Sunny	Tuesday night Fog late	Wednesday Sunny	Wednesday night Fair	Thursday Mostly Sunny

Low: 51°	High: 76°	Low: 48°	High: 78°	Low: 51°	High: 82°	Low: 51°	High: 79°

NNW 4-24 mph	NE 4-24 mph	ENE→ESE 2 mph	SSE 4-23 mph	SSW 4 mph	WSW 4-22 mph	N 2 mph	N→ENE 4-21 mph
	UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Tonight	Clear. Patchy light fog after midnight. Low 51°. Wind north-northwest around 4 mph, gusting to 24 mph.
Monday	Sunny. Patchy light fog in the morning. Warm. High 76°. UV index up to 5. Wind northeast around 4 mph, gusting to 24 mph.
Monday night	Clear. Low 48°. Wind east-northeast around 2 mph in the evening, becoming east-southeast after midnight.
Tuesday	Sunny. Warm. High 78°. UV index up to 5. Wind south-southeast around 4 mph, gusting to 23 mph.
Tuesday night	Clear. Patchy light fog after midnight. Low 51°. Wind south-southwest around 4 mph.
Wednesday	Sunny. Warm. High 82°. UV index up to 5. Wind west-southwest around 4 mph, gusting to 22 mph.
Wednesday night	Fair. Low 51°. Wind north around 2 mph.
Thursday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Warm. High 79°. UV index up to 5. Wind north around 4 mph, gusting to 21 mph, in the morning, becoming east-northeast in the afternoon.
Thursday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 52°. Wind east-northeast around 4 mph.
Friday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 81°. Wind southeast around 5 mph, gusting to 21 mph.
Friday night	Clear. Patchy light fog after midnight. Low 52°. Wind south-southeast around 5 mph.
Saturday	Sunny. Patchy light fog in the morning. Unusually hot. High 85°. UV index up to 4. Wind south-southeast around 4 mph, gusting to 17 mph, in the morning, becoming 9 mph, gusting to 23 mph, in the afternoon.
Saturday night	Partly cloudy. Low 57°. Wind south-southeast around 5 mph, gusting to 15 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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