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 05:00 am

Today Thunder storm	Tonight Thunder storm	Saturday Thunder storm	Saturday night Thunder storm	Sunday Thunder storm	Sunday night Thunder storm	Monday Thunder storm	Monday night Thunder storm
<.1 in.	<.1 in.	<.25 in.	<.1 in.	.1 in.	<.25 in.	<.25 in.	<.1 in.
High: 85°	Low: 66°	High: 78°	Low: 62°	High: 82°	Low: 65°	High: 85°	Low: 65°

E 7-26 mph	E 4-21 mph	E 6-22 mph	E 6-21 mph	E→SSE 6-23 mph	SSE 4-19 mph	SSE→ENE 4-22 mph	ENE 5-19 mph
UV: 7 High		UV: 5 Medium		UV: 6 High		UV: 8 Very High

Today	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain. Scattered thundershowers possible. High 85°. UV index up to 7. Wind east around 7 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Scattered thundershowers possible. Low 66°. Wind east around 4 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. High 78°. UV index up to 5. Wind east around 6 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Low 62°. Wind east around 6 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Mostly cloudy to cloudy in the morning, becoming mostly 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. High 82°. UV index up to 6. Wind east around 6 mph, gusting to 23 mph, in the morning, becoming south-southeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Sunday night	Fair to partly cloudy. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 65°. Wind south-southeast around 4 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Monday	Partly cloudy. Moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. Warm. High 85°. UV index up to 8. Wind south-southeast around 4 mph, gusting to 22 mph, in the morning, becoming east-northeast in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Monday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A slight chance of rain. Scattered thundershowers possible. Low 65°. Wind east-northeast around 5 mph, gusting to 19 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 84°. UV index up to 9. Wind east-northeast around 7 mph, gusting to 25 mph.
Tuesday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 61°. Wind east around 6 mph, gusting to 23 mph.
Wednesday	Mostly sunny in the morning, becoming sunny in the afternoon. High 83°. UV index up to 8. Wind east-southeast around 5 mph, gusting to 24 mph.
Wednesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 60°. Wind southeast around 4 mph, gusting to 20 mph.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Hot. High 86°. UV index up to 9. Wind south-southeast around 6 mph, gusting to 25 mph.
Thursday night	Mostly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain after midnight. Low 66°. Wind east-southeast around 6 mph, gusting to 22 mph, in the evening, becoming 3 mph after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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