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, 23-Sep-2025 05:00 am

Today Thunder storm	Tonight Thunder storm	Wednesday Thunder storm	Wednesday night Chance rain	Thursday Fog a.m.	Thursday night Fog late	Friday Fog a.m.	Friday night Fog
.25 in.	1.5 in.	.1 in.	.1 in.
High: 80°	Low: 69°	High: 76°	Low: 64°	High: 76°	Low: 58°	High: 78°	Low: 59°

SSE 3-18→6-23 mph	SE→NE 5-19 mph	NNW 7-24 mph	NNW 4-16 mph	NW 5-22 mph	NW→WSW 3-18 mph	WSW 2-18 mph	SSE→SSW 3 mph
				UV: 5 Medium		UV: 6 High

Today	Mostly cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. Warm. High 80°. Wind south-southeast around 3 mph, gusting to 18 mph, in the morning, becoming 6 mph, gusting to 23 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Tonight	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Moderate fog. Rain very likely. Scattered thundershowers possible. Warm. Low 69°. Wind southeast around 5 mph, gusting to 19 mph, in the evening, becoming northeast after midnight. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches.
Wednesday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 76°. Wind north-northwest around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Wednesday night	Partly to mostly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 64°. Wind north-northwest around 4 mph, gusting to 16 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Thursday	Partly cloudy in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning. High 76°. UV index up to 5. Wind northwest around 5 mph, gusting to 22 mph.
Thursday night	Clear. Patchy light fog after midnight. Low 58°. Wind northwest around 3 mph, gusting to 18 mph, in the evening, becoming west-southwest after midnight.
Friday	Sunny. Patchy light fog in the morning. Warm. High 78°. UV index up to 6. Wind west-southwest around 2 mph, gusting to 18 mph.
Friday night	Clear. Patchy light fog. Low 59°. Wind south-southeast around 3 mph in the evening, becoming south-southwest after midnight.
Saturday	Sunny. Patchy light fog in the morning. Warm. High 81°. UV index up to 6. Wind west around 3 mph, gusting to 20 mph.
Saturday night	Clear. Patchy light fog after midnight. Low 57°. Wind west-northwest near calm.
Sunday	Sunny. Patchy light fog in the morning. Warm. High 81°. UV index up to 6. Wind north-northeast around 2 mph, gusting to 18 mph, in the morning, becoming east-southeast in the afternoon.
Sunday night	Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog. Low 61°. Wind southeast around 3 mph.
Monday	Partly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Warm. High 84°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 21 mph.
Monday night	Fair. Patchy light fog after midnight. Low 62°. Wind east-southeast around 4 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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