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: Thursday, 01-Oct-2026 05:00 am

Today Chance rain	Tonight Rain likely	Friday Fog a.m.	Friday night Fog late	Saturday Fog a.m.	Saturday night Fog late	Sunday Fog a.m.	Sunday night Fog late
<.25 in.	1.5 in.	<.1 in.
High: 86°	Low: 69°	High: 74°	Low: 55°	High: 73°	Low: 53°	High: 74°	Low: 54°

SSW 6-26 mph	NW→NNE 3-20→8-25 mph	NNE 9-27 mph	NNE 5-24 mph	ENE 5-24 mph	ENE→NNE 2-17 mph	NNW 4-23 mph	NNW 5-15 mph
		UV: 4 Medium		UV: 6 High		UV: 5 Medium

Today	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. Unusually hot. High 86°. Wind south-southwest around 6 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Tonight	Dense overcast. Patchy light fog in the evening, then light to moderate fog after midnight. Rain very likely. Warm. Low 69°. Wind northwest around 3 mph, gusting to 20 mph, in the evening, becoming north-northeast around 8 mph, gusting to 25 mph, after midnight. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches.
Friday	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. High 74°. UV index up to 4. Wind north-northeast around 9 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Clear. Light to moderate fog after midnight. Low 55°. Wind north-northeast around 5 mph, gusting to 24 mph.
Saturday	Sunny. Light to moderate fog in the morning. High 73°. UV index up to 6. Wind east-northeast around 5 mph, gusting to 24 mph.
Saturday night	Fair to partly cloudy. Patchy light fog after midnight. Low 53°. Wind east-northeast around 2 mph, gusting to 17 mph, in the evening, becoming north-northeast after midnight.
Sunday	Sunny. Patchy light fog in the morning. High 74°. UV index up to 5. Wind north-northwest around 4 mph, gusting to 23 mph.
Sunday night	Clear. Light to moderate fog after midnight. Low 54°. Wind north-northwest around 5 mph, gusting to 15 mph.
Monday	Sunny. Light to moderate fog in the morning. High 71°. UV index up to 5. Wind north-northeast around 5 mph, gusting to 24 mph.
Monday night	Clear. Patchy light fog after midnight. Low 50°. Wind north-northeast around 3 mph, gusting to 17 mph, in the evening, becoming east after midnight.
Tuesday	Sunny. Patchy light fog in the morning. High 73°. UV index up to 5. Wind southeast around 4 mph, gusting to 24 mph.
Tuesday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 54°. Wind south-southeast around 3 mph, gusting to 16 mph.
Wednesday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Warm. High 76°. UV index up to 5. Wind south-southwest around 6 mph, gusting to 24 mph, in the morning, becoming west-southwest in the afternoon.
Wednesday night	Clear. Patchy light fog after midnight. Low 52°. Wind north-northwest around 4 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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