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, 08-May-2026 05:00 am

Today Chance rain	Tonight Chance rain	Saturday Fog a.m.	Saturday night Mostly Cloudy	Sunday Mostly Cloudy	Sunday night Clear	Monday Partly Cloudy	Monday night Fog late
.1 in.	<.1 in.			<.1 in.
High: 74°	Low: 53°	High: 78°	Low: 54°	High: 68°	Low: 45°	High: 73°	Low: 49°

SW 8-26 mph	W 5-17 mph	W 8-26 mph	W→N 6-20 mph	NNE 8-27 mph	NNW 3-23 mph	WSW 5-24 mph	SW 4-20 mph
UV: 6 High		UV: 7 High		UV: 6 High		UV: 7 High

Today	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. High 74°. UV index up to 6. Wind southwest around 8 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Tonight	Cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Low 53°. Wind west around 5 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Mostly sunny. Moderate fog in the morning. High 78°. UV index up to 7. Wind west around 8 mph, gusting to 26 mph.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 54°. Wind west around 6 mph, gusting to 20 mph, in the evening, becoming north after midnight.
Sunday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. High 68°. UV index up to 6. Wind north-northeast around 8 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Fair in the evening, becoming clear after midnight. Cool. Low 45°. Wind north-northwest around 3 mph, gusting to 23 mph.
Monday	Sunny in the morning, becoming partly cloudy in the afternoon. High 73°. UV index up to 7. Wind west-southwest around 5 mph, gusting to 24 mph.
Monday night	Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Cool. Low 49°. Wind southwest around 4 mph, gusting to 20 mph.
Tuesday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 75°. UV index up to 5. Wind south-southwest around 9 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch.
Tuesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 54°. Wind west-southwest around 8 mph, gusting to 20 mph.
Wednesday	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 66°. UV index up to 5. Wind north-northwest around 11 mph, gusting to 29 mph.
Wednesday night	Fair in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 46°. Wind north-northwest around 5 mph, gusting to 25 mph.
Thursday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 73°. UV index up to 9. Wind east around 5 mph, gusting to 26 mph.
Thursday night	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. A chance of rain. Cool. Low 52°. Wind east around 7 mph, gusting to 23 mph. Chance of precipitation 30 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