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, 26-Apr-2026 04:00 pm

Tonight Partly Cloudy	Monday Thunder storm	Monday night Thunder storm	Tuesday Fog a.m.	Tuesday night Rain likely	Wednesday Fog a.m.	Wednesday night Clear	Thursday Partly Cloudy
	<.25 in.	.1 in.		.5 in.
Low: 62°	High: 82°	Low: 58°	High: 77°	Low: 54°	High: 66°	Low: 45°	High: 66°

SE 9-26 mph	SE→SSW 13-31→17-33 mph	W 11-27→7-19 mph	WNW 5-28 mph	NNE 7-23 mph	NNW 11-28 mph	NNW 5-26 mph	NNW 4-23 mph
	UV: 5 Medium		UV: 7 High		UV: 6 High		UV: 6 High

Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 62°. Wind southeast around 9 mph, gusting to 26 mph.
Monday	Mostly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some severe. Breezy and warm. High 82°. UV index up to 5. Wind southeast around 13 mph, gusting to 31 mph, in the morning, becoming south-southwest around 17 mph, gusting to 33 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Monday night	Fair in the evening, becoming mostly clear after midnight. Light to moderate fog. A chance of rain. Scattered thundershowers possible. Low 58°. Wind west around 11 mph, gusting to 27 mph, in the evening, becoming 7 mph, gusting to 19 mph, after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Tuesday	Sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. Warm. High 77°. UV index up to 7. Wind west-northwest around 5 mph, gusting to 28 mph.
Tuesday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 54°. Wind north-northeast around 7 mph, gusting to 23 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Wednesday	Sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. High 66°. UV index up to 6. Wind north-northwest around 11 mph, gusting to 28 mph.
Wednesday night	Clear. Cool. Low 45°. Wind north-northwest around 5 mph, gusting to 26 mph.
Thursday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 66°. UV index up to 6. Wind north-northwest around 4 mph, gusting to 23 mph.
Thursday night	Mostly cloudy. Patchy light fog after midnight. A chance of rain. Low 48°. Wind west-northwest around 3 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Friday	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 63°. UV index up to 6. Wind northwest around 6 mph, gusting to 27 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon.
Friday night	Clear. Cool. Low 43°. Wind north around 6 mph, gusting to 26 mph, in the evening, becoming east-northeast around 2 mph after midnight.
Saturday	Sunny. High 67°. UV index up to 9. Wind southwest around 3 mph, gusting to 30 mph, in the morning, becoming west-northwest in the afternoon.
Saturday night	Clear in the evening, becoming partly cloudy after midnight. Low 49°. Wind south around 5 mph, gusting to 16 mph, in the evening, becoming 8 mph, gusting to 17 mph, after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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