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: Monday, 19-Oct-2026 05:00 am

Today Mostly Sunny	Tonight Partly Cloudy	Tuesday Mostly Sunny	Tuesday night Clear	Wednesday Sunny	Wednesday night Clear	Thursday Sunny	Thursday night Clear

High: 69°	Low: 44°	High: 71°	Low: 43°	High: 71°	Low: 43°	High: 72°	Low: 45°

SSE 2-20 mph	ESE 2 mph	SE 2-19 mph	E→SSE 2 mph	SSE→E 1-22 mph	ESE→S calm	ESE 2-20 mph	ESE 2 mph
UV: 5 Medium		UV: 4 Medium		UV: 5 Medium		UV: 4 Medium

Today	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 69°. UV index up to 5. Wind south-southeast around 2 mph, gusting to 20 mph.
Tonight	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 44°. Wind east-southeast around 2 mph.
Tuesday	Mostly sunny. Mild. High 71°. UV index up to 4. Wind southeast around 2 mph, gusting to 19 mph.
Tuesday night	Fair in the evening, becoming clear after midnight. Low 43°. Wind east around 2 mph in the evening, becoming south-southeast after midnight.
Wednesday	Sunny. Mild. High 71°. UV index up to 5. Wind south-southeast around 1 mph, gusting to 22 mph, in the morning, becoming east in the afternoon.
Wednesday night	Clear. Low 43°. Wind east-southeast near calm in the evening, becoming south after midnight.
Thursday	Sunny. Warm. High 72°. UV index up to 4. Wind east-southeast around 2 mph, gusting to 20 mph.
Thursday night	Clear. Low 45°. Wind east-southeast around 2 mph.
Friday	Sunny. Warm. High 74°. UV index up to 5. Wind southeast around 4 mph, gusting to 23 mph.
Friday night	Clear in the evening, becoming partly cloudy after midnight. Low 49°. Wind southeast around 4 mph.
Saturday	Partly cloudy. Warm. High 76°. UV index up to 4. Wind southeast around 5 mph, gusting to 24 mph.
Saturday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 51°. Wind south around 6 mph, gusting to 16 mph.
Sunday	Mostly cloudy. Warm. High 74°. Wind south around 8 mph, gusting to 22 mph, in the morning, becoming west-southwest in the afternoon.
Sunday night	Partly cloudy in the evening, becoming cloudy after midnight. Low 53°. Wind west-southwest near calm in the evening, becoming east-southeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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