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, 18-Oct-2026 05:00 am

Today Mostly Sunny	Tonight Fair	Monday Partly Cloudy	Monday night Partly Cloudy	Tuesday Mostly Sunny	Tuesday night Clear	Wednesday Sunny	Wednesday night Clear

High: 66°	Low: 41°	High: 69°	Low: 44°	High: 71°	Low: 42°	High: 72°	Low: 42°

S 5-24 mph	SSE 3-17 mph	S 2-20 mph	ESE 2 mph	SE 2-21 mph	SE 2 mph	S 2-19 mph	ESE→S calm
UV: 5 Medium		UV: 4 Medium		UV: 4 Medium		UV: 5 Medium

Today	Mostly sunny. High 66°. UV index up to 5. Wind south around 5 mph, gusting to 24 mph.
Tonight	Fair. Low 41°. Wind south-southeast around 3 mph, gusting to 17 mph.
Monday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 69°. UV index up to 4. Wind south around 2 mph, gusting to 20 mph.
Monday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 44°. Wind east-southeast around 2 mph.
Tuesday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Mild. High 71°. UV index up to 4. Wind southeast around 2 mph, gusting to 21 mph.
Tuesday night	Clear. Low 42°. Wind southeast around 2 mph.
Wednesday	Sunny. Mild. High 72°. UV index up to 5. Wind south around 2 mph, gusting to 19 mph.
Wednesday night	Clear. Low 42°. Wind east-southeast near calm in the evening, becoming south after midnight.
Thursday	Sunny. Mild. High 72°. UV index up to 4. Wind east-southeast around 2 mph, gusting to 18 mph.
Thursday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 47°. Wind east around 2 mph.
Friday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Warm. High 72°. UV index up to 4. Wind east-southeast around 5 mph, gusting to 23 mph.
Friday night	Partly cloudy. Patchy light fog after midnight. Low 48°. Wind southeast around 5 mph, gusting to 15 mph.
Saturday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 78°. Wind south around 7 mph, gusting to 22 mph.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 55°. Wind south around 5 mph in the evening, becoming west after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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