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: Tuesday, 20-Oct-2026 05:00 am

Today Mostly Sunny	Tonight Fair	Wednesday Partly Cloudy	Wednesday night Clear	Thursday Sunny	Thursday night Fog late	Friday Fog a.m.	Friday night Partly Cloudy

High: 75°	Low: 49°	High: 75°	Low: 47°	High: 74°	Low: 48°	High: 74°	Low: 49°

SE 2-21 mph	E→SSE 2 mph	S→ESE 1-20 mph	E→WSW calm	SE 1-19 mph	SE 2 mph	SE 4-23 mph	ESE 4 mph
UV: 5 Medium		UV: 5 Medium		UV: 4 Medium		UV: 5 Medium

Today	Mostly sunny. Warm. High 75°. UV index up to 5. Wind southeast around 2 mph, gusting to 21 mph.
Tonight	Fair. Low 49°. Wind east around 2 mph in the evening, becoming south-southeast after midnight.
Wednesday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Warm. High 75°. UV index up to 5. Wind south around 1 mph, gusting to 20 mph, in the morning, becoming east-southeast in the afternoon.
Wednesday night	Fair in the evening, becoming clear after midnight. Low 47°. Wind east near calm in the evening, becoming west-southwest after midnight.
Thursday	Sunny. Warm. High 74°. UV index up to 4. Wind southeast around 1 mph, gusting to 19 mph.
Thursday night	Clear. Patchy light fog after midnight. Low 48°. Wind southeast around 2 mph.
Friday	Sunny. Patchy light fog in the morning. Warm. High 74°. UV index up to 5. Wind southeast around 4 mph, gusting to 23 mph.
Friday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 49°. Wind east-southeast around 4 mph.
Saturday	Partly to mostly sunny. Warm. High 75°. UV index up to 4. Wind east-southeast around 5 mph, gusting to 21 mph.
Saturday night	Partly cloudy. Low 48°. Wind southeast around 4 mph in the evening, becoming south after midnight.
Sunday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 76°. Wind south around 4 mph, gusting to 18 mph.
Sunday night	Partly cloudy. Low 48°. Wind south around 4 mph.
Monday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Warm. High 75°. Wind southwest around 8 mph, gusting to 26 mph.
Monday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A chance of rain. Low 51°. Wind west-northwest around 8 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 5.1.6 (b5016) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5