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: Friday, 10-Apr-2026 04:00 pm

Tonight Fog late	Saturday Fog a.m.	Saturday night Fog late	Sunday Fog a.m.	Sunday night Mostly Clear	Monday Sunny	Monday night Clear	Tuesday Sunny

Low: 48°	High: 74°	Low: 47°	High: 79°	Low: 49°	High: 79°	Low: 49°	High: 82°

NNE 3-29 mph	E→SSE 6-22 mph	SSE 7-18 mph	SSE 10-26 mph	SSW 8-22 mph	SSW 10-29→15-31 mph	SSW 11-27 mph	SSW 13-30 mph
	UV: 8 Very High		UV: 8 Very High		UV: 8 Very High		UV: 8 Very High

Tonight	Mostly clear in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 48°. Wind north-northeast around 3 mph, gusting to 29 mph.
Saturday	Sunny. Light to moderate fog in the morning. Warm. High 74°. UV index up to 8. Wind east around 6 mph, gusting to 22 mph, in the morning, becoming south-southeast in the afternoon.
Saturday night	Clear. Patchy light fog after midnight. Low 47°. Wind south-southeast around 7 mph, gusting to 18 mph.
Sunday	Sunny. Patchy light fog in the morning. Warm. High 79°. UV index up to 8. Wind south-southeast around 10 mph, gusting to 26 mph.
Sunday night	Mostly clear in the evening, becoming clear after midnight. Low 49°. Wind south-southwest around 8 mph, gusting to 22 mph.
Monday	Sunny. Breezy and warm. High 79°. UV index up to 8. Wind south-southwest around 10 mph, gusting to 29 mph, in the morning, becoming 15 mph, gusting to 31 mph, in the afternoon.
Monday night	Clear. Low 49°. Wind south-southwest around 11 mph, gusting to 27 mph.
Tuesday	Sunny. Breezy and unusually hot. High 82°. UV index up to 8. Wind south-southwest around 13 mph, gusting to 30 mph.
Tuesday night	Clear. Low 49°. Wind south-southwest around 11 mph, gusting to 27 mph.
Wednesday	Sunny. Breezy and unusually hot. High 83°. UV index up to 8. Wind south-southwest around 13 mph, gusting to 30 mph.
Wednesday night	Clear. Low 49°. Wind south-southwest around 11 mph, gusting to 27 mph.
Thursday	Sunny. Breezy and unusually hot. High 84°. UV index up to 8. Wind south-southwest around 13 mph, gusting to 30 mph.
Thursday night	Clear. Low 49°. Wind south-southwest around 11 mph, gusting to 26 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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