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, 29-May-2026 04:00 pm

Tonight Fog late	Saturday Fog a.m.	Saturday night Fog late	Sunday Thunder storm	Sunday night Fog late	Monday Thunder storm	Monday night Fog late	Tuesday Thunder storm
			<.1 in.		<.1 in.		<.1 in.
Low: 67°	High: 86°	Low: 67°	High: 85°	Low: 63°	High: 86°	Low: 63°	High: 85°

ESE 5-20 mph	ESE 6-26 mph	ESE 7-23 mph	SE 6-25 mph	SE→NE 3-21 mph	SSW→NNW 3-24 mph	NE 4-20 mph	ENE 7-25 mph
	UV: 8 Very High		UV: 8 Very High		UV: 7 High		UV: 7 High

Tonight	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Low 67°. Wind east-southeast around 5 mph, gusting to 20 mph.
Saturday	Partly cloudy. Patchy light fog in the morning. Hot. High 86°. UV index up to 8. Wind east-southeast around 6 mph, gusting to 26 mph.
Saturday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Low 67°. Wind east-southeast around 7 mph, gusting to 23 mph.
Sunday	Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. Hot. High 85°. UV index up to 8. Wind southeast around 6 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Fair. Patchy light fog after midnight. Low 63°. Wind southeast around 3 mph, gusting to 21 mph, in the evening, becoming northeast after midnight.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. Hot. High 86°. UV index up to 7. Wind south-southwest around 3 mph, gusting to 24 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 63°. Wind northeast around 4 mph, gusting to 20 mph.
Tuesday	Partly to mostly cloudy. Patchy light fog in the morning. A slight chance of rain in the afternoon. Scattered thundershowers possible. High 85°. UV index up to 7. Wind east-northeast around 7 mph, gusting to 25 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Partly cloudy. Low 60°. Wind east around 5 mph, gusting to 22 mph.
Wednesday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Hot. High 85°. UV index up to 8. Wind southeast around 6 mph, gusting to 25 mph.
Wednesday night	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 58°. Wind southeast around 5 mph, gusting to 22 mph.
Thursday	Partly cloudy. Hot. High 88°. UV index up to 8. Wind south around 4 mph, gusting to 25 mph.
Thursday night	Mostly clear in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain after midnight. Precipitation showery or intermittent. Low 64°. Wind southeast around 5 mph, gusting to 19 mph, in the evening, becoming south after midnight. Chance of precipitation 20 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 4.6.4 (b4128) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5