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: Wednesday, 08-Apr-2026 04:00 pm

Tonight Fair	Thursday Mostly Sunny	Thursday night Clear	Friday Sunny	Friday night Mostly Clear	Saturday Sunny	Saturday night Clear	Sunday Sunny

Low: 49°	High: 79°	Low: 49°	High: 80°	Low: 48°	High: 80°	Low: 48°	High: 81°

SSW 7-28 mph	SSW 7-25 mph	SSW 5-18→9 mph	SW→NW 7-27 mph	NNE 3-22 mph	E→SSE 5-26 mph	SSE 7-21 mph	SSE 10-27 mph
	UV: 6 High		UV: 6 High		UV: 7 High		UV: 7 High

Tonight	Fair. Low 49°. Wind south-southwest around 7 mph, gusting to 28 mph.
Thursday	Mostly sunny. Warm. High 79°. UV index up to 6. Wind south-southwest around 7 mph, gusting to 25 mph.
Thursday night	Fair in the evening, becoming clear after midnight. Low 49°. Wind south-southwest around 5 mph, gusting to 18 mph, in the evening, becoming 9 mph after midnight.
Friday	Sunny. Warm. High 80°. UV index up to 6. Wind southwest around 7 mph, gusting to 27 mph, in the morning, becoming northwest in the afternoon.
Friday night	Mostly clear in the evening, becoming clear after midnight. Low 48°. Wind north-northeast around 3 mph, gusting to 22 mph.
Saturday	Sunny. Unusually warm. High 80°. UV index up to 7. Wind east around 5 mph, gusting to 26 mph, in the morning, becoming south-southeast in the afternoon.
Saturday night	Clear. Low 48°. Wind south-southeast around 7 mph, gusting to 21 mph.
Sunday	Sunny. Unusually warm. High 81°. UV index up to 7. Wind south-southeast around 10 mph, gusting to 27 mph.
Sunday night	Mostly clear in the evening, becoming clear after midnight. Low 50°. Wind south-southwest around 8 mph, gusting to 23 mph.
Monday	Sunny. Breezy and unusually hot. High 82°. UV index up to 8. Wind south-southwest around 10 mph, gusting to 29 mph, in the morning, becoming 15 mph, gusting to 32 mph, in the afternoon.
Monday night	Clear. Low 50°. 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 50°. Wind south-southwest around 11 mph, gusting to 27 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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