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: Friday, 24-Apr-2026 04:00 pm

Tonight Partly Cloudy	Saturday Fog a.m.	Saturday night Fog late	Sunday Fog a.m.	Sunday night Partly Cloudy	Monday Thunder storm	Monday night Thunder storm	Tuesday Fog a.m.
					.1 in.	.1 in.	<.1 in.
Low: 56°	High: 77°	Low: 52°	High: 76°	Low: 54°	High: 82°	Low: 56°	High: 76°

N 3-23 mph	NE 5-24 mph	NE 5-20 mph	ESE 7-25 mph	ESE 9-22 mph	SSE 14-33→18-35 mph	WSW 10-23→7-17 mph	WNW 5-24 mph
	UV: 6 High		UV: 7 High		UV: 7 High		UV: 7 High

Tonight	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 56°. Wind north around 3 mph, gusting to 23 mph.
Saturday	Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Warm. High 77°. UV index up to 6. Wind northeast around 5 mph, gusting to 24 mph.
Saturday night	Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 52°. Wind northeast around 5 mph, gusting to 20 mph.
Sunday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 76°. UV index up to 7. Wind east-southeast around 7 mph, gusting to 25 mph.
Sunday night	Partly cloudy. Low 54°. Wind east-southeast around 9 mph, gusting to 22 mph.
Monday	Partly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Breezy and warm. High 82°. UV index up to 7. Wind south-southeast around 14 mph, gusting to 33 mph, in the morning, becoming 18 mph, gusting to 35 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch.
Monday night	Fair to partly cloudy. Moderate fog. A chance of rain. Scattered thunderstorms likely. Low 56°. Wind west-southwest around 10 mph, gusting to 23 mph, in the evening, becoming 7 mph, gusting to 17 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Tuesday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. A chance of rain in the afternoon. Warm. High 76°. UV index up to 7. Wind west-northwest around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light 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 52°. Wind north around 6 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Wednesday	Partly cloudy. Light to moderate fog in the morning. A slight chance of rain. High 66°. UV index up to 7. Wind north around 9 mph, gusting to 28 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Clear. Patchy light fog after midnight. Cool. Low 46°. Wind north around 5 mph, gusting to 24 mph.
Thursday	Sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 67°. UV index up to 8. Wind north-northwest around 6 mph, gusting to 24 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. A chance of rain. Cool. Low 47°. Wind west around 5 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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