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, 28-Apr-2026 05:00 am

Today Chance rain	Tonight Chance rain	Wednesday Fog a.m.	Wednesday night Partly Cloudy	Thursday Mostly Cloudy	Thursday night Chance rain	Friday Partly Cloudy	Friday night Mostly Cloudy
<.1 in.	<.25 in.				.1 in.
High: 76°	Low: 53°	High: 66°	Low: 44°	High: 66°	Low: 46°	High: 60°	Low: 41°

WNW→NE 5-30 mph	NNE 5-18 mph	NNW 9-27 mph	NNW 6-24→3 mph	WNW 2-29→6-26 mph	W→NNW 4-17 mph	N 10-28 mph	N 4-24 mph
UV: 7 High		UV: 5 Medium		UV: 6 High		UV: 7 High

Today	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain in the afternoon. High 76°. UV index up to 7. Wind west-northwest around 5 mph, gusting to 30 mph, in the morning, becoming northeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Low 53°. Wind north-northeast around 5 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Wednesday	Sunny in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. High 66°. UV index up to 5. Wind north-northwest around 9 mph, gusting to 27 mph.
Wednesday night	Partly cloudy in the evening, becoming clear after midnight. Cool. Low 44°. Wind north-northwest around 6 mph, gusting to 24 mph, in the evening, becoming 3 mph after midnight.
Thursday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 66°. UV index up to 6. Wind west-northwest around 2 mph, gusting to 29 mph, in the morning, becoming 6 mph, gusting to 26 mph, in the afternoon.
Thursday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Cool. Low 46°. Wind west around 4 mph, gusting to 17 mph, in the evening, becoming north-northwest after midnight. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Friday	Partly cloudy. Cool. High 60°. UV index up to 7. Wind north around 10 mph, gusting to 28 mph.
Friday night	Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Cool. Low 41°. Wind north around 4 mph, gusting to 24 mph.
Saturday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Cool. High 59°. UV index up to 6. Wind north-northwest around 6 mph, gusting to 27 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon.
Saturday night	Fair in the evening, becoming clear after midnight. Cool. Low 41°. Wind north-northwest around 4 mph, gusting to 22 mph, in the evening, becoming southwest after midnight.
Sunday	Sunny in the morning, becoming partly cloudy in the afternoon. High 68°. UV index up to 6. Wind southwest around 8 mph, gusting to 26 mph.
Sunday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. A slight chance of rain. Low 48°. Wind southwest around 5 mph, gusting to 20 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 69°. UV index up to 6. Wind west-southwest around 6 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Monday night	Clear. Patchy light fog after midnight. Low 51°. Wind west-southwest around 6 mph, gusting to 17 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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