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, 09-Apr-2026 05:00 am

Today Mostly Sunny	Tonight Clear	Friday Sunny	Friday night Mostly Clear	Saturday Sunny	Saturday night Clear	Sunday Sunny	Sunday night Mostly Clear

High: 88°	Low: 56°	High: 86°	Low: 53°	High: 84°	Low: 51°	High: 84°	Low: 53°

SW 7-27 mph	S 4-22→9 mph	SW→NW 7-28 mph	NNE 2-24 mph	E→SSE 5-27 mph	SSE 7-23 mph	SSE 9-28 mph	SSW 8-25 mph
UV: 8 Very High		UV: 8 Very High		UV: 8 Very High		UV: 8 Very High

Today	Mostly sunny. Unusually hot. High 88°. UV index up to 8. Wind southwest around 7 mph, gusting to 27 mph.
Tonight	Fair in the evening, becoming clear after midnight. Low 56°. Wind south around 4 mph, gusting to 22 mph, in the evening, becoming 9 mph after midnight.
Friday	Sunny. Unusually hot. High 86°. UV index up to 8. Wind southwest around 7 mph, gusting to 28 mph, in the morning, becoming northwest in the afternoon.
Friday night	Mostly clear in the evening, becoming clear after midnight. Low 53°. Wind north-northeast around 2 mph, gusting to 24 mph.
Saturday	Sunny. Unusually hot. High 84°. UV index up to 8. Wind east around 5 mph, gusting to 27 mph, in the morning, becoming south-southeast in the afternoon.
Saturday night	Clear. Low 51°. Wind south-southeast around 7 mph, gusting to 23 mph.
Sunday	Sunny. Unusually hot. High 84°. UV index up to 8. Wind south-southeast around 9 mph, gusting to 28 mph.
Sunday night	Mostly clear in the evening, becoming clear after midnight. Low 53°. Wind south-southwest around 8 mph, gusting to 25 mph.
Monday	Sunny. Breezy and unusually hot. High 84°. UV index up to 8. Wind south-southwest around 10 mph, gusting to 30 mph, in the morning, becoming 14 mph, gusting to 32 mph, in the afternoon.
Monday night	Clear. Low 52°. Wind south-southwest around 11 mph, gusting to 27 mph.
Tuesday	Sunny. Breezy and unusually hot. High 83°. UV index up to 8. Wind south-southwest around 13 mph, gusting to 31 mph.
Tuesday night	Clear. Low 52°. Wind south-southwest around 11 mph, gusting to 28 mph.
Wednesday	Sunny. Breezy and unusually hot. High 82°. UV index up to 8. Wind south-southwest around 13 mph, gusting to 32 mph.
Wednesday night	Clear. Low 53°. Wind south-southwest around 11 mph, gusting to 29 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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