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, 27-Jun-2025 04:00 pm

Tonight Thunder storm	Saturday Thunder storm	Saturday night Thunder storm	Sunday Thunder storm	Sunday night Thunder storm	Monday Thunder storm	Monday night Thunder storm	Tuesday Fog a.m.
<.1 in.	<.1 in.	<.1 in.	<.1 in.	.25 in.	.1 in.	<.1 in.
Low: 69°	High: 89°	Low: 72°	High: 90°	Low: 73°	High: 87°	Low: 72°	High: 89°
	Heat: 93°		Heat: 96°		Heat: 93°		Heat: 95°
WSW 3 mph	SSW 4-23 mph	S 4-18 mph	SW 5-23 mph	SW 4-19 mph	WSW 5-23 mph	NW 4-18 mph	NW 5-24 mph
	UV: 8 Very High		UV: 8 Very High		UV: 7 High		UV: 10 Very High

Tonight	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Low 69°. Wind west-southwest around 3 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain. Scattered thunderstorms likely. High 89°. Heat index up to 93°. UV index up to 8. Wind south-southwest around 4 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Mostly cloudy. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 72°. Wind south around 4 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Scattered thunderstorms likely. High 90°. Heat index up to 96°. UV index up to 8. Wind southwest around 5 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 73°. Wind southwest around 4 mph, gusting to 19 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Monday	Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Scattered thunderstorms likely. High 87°. Heat index up to 93°. UV index up to 7. Wind west-southwest around 5 mph, gusting to 23 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch.
Monday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain. Scattered thundershowers possible. Low 72°. Wind northwest around 4 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. High 89°. Heat index up to 95°. UV index up to 10. Wind northwest around 5 mph, gusting to 24 mph.
Tuesday night	Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 69°. Wind northwest around 3 mph, gusting to 19 mph, in the evening, becoming west after midnight.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 90°. Heat index up to 97°. UV index up to 10. Wind southwest around 3 mph, gusting to 21 mph.
Wednesday night	Mostly clear. Light to moderate fog after midnight. Low 70°. Wind south-southwest around 3 mph, gusting to 16 mph.
Thursday	Mostly sunny. Patchy light fog in the morning. A chance of rain in the afternoon. Scattered thunderstorms likely. Hot. High 94°. Heat index up to 102°. UV index up to 10. Wind west around 7 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 74°. Wind west around 3 mph, gusting to 16 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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