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: Saturday, 05-Jul-2025 05:00 am

Today Partly Cloudy	Tonight Fog late	Sunday Chance rain	Sunday night Fog late	Monday Chance rain	Monday night Fog late	Tuesday Fog a.m.	Tuesday night Fog late
	<.1 in.	.25 in.	<.1 in.	<.1 in.	<.1 in.		<.1 in.
High: 94°	Low: 72°	High: 87°	Low: 74°	High: 88°	Low: 72°	High: 90°	Low: 74°
		Heat: 92°		Heat: 96°		Heat: 98°
S 6-25 mph	SW 5-20 mph	SW 7-24 mph	SW 3 mph	WSW→NW 4-22 mph	NNE→NNW 2-19 mph	N 2-20 mph	E→SSE 2-16 mph
UV: 8 Very High		UV: 7 High		UV: 9 Very High		UV: 8 Very High

Today	Sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 94°. UV index up to 8. Wind south around 6 mph, gusting to 25 mph.
Tonight	Partly cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 72°. Wind southwest around 5 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. High 87°. Heat index up to 92°. UV index up to 7. Wind southwest around 7 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Sunday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 74°. Wind southwest around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday	Partly to mostly cloudy. Light to moderate fog in the morning. A chance of rain. High 88°. Heat index up to 96°. UV index up to 9. Wind west-southwest around 4 mph, gusting to 22 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Mostly cloudy to cloudy in the evening, becoming fair to partly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Low 72°. Wind north-northeast around 2 mph, gusting to 19 mph, in the evening, becoming north-northwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Partly cloudy. Light to moderate fog in the morning. Hot. High 90°. Heat index up to 98°. UV index up to 8. Wind north around 2 mph, gusting to 20 mph.
Tuesday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain. Low 74°. Wind east around 2 mph, gusting to 16 mph, in the evening, becoming south-southeast after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday	Partly cloudy in the morning, becoming partly to mostly sunny 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 89°. Heat index up to 98°. UV index up to 9. Wind south-southwest around 3 mph, gusting to 21 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Wednesday night	Fair to partly cloudy in the evening, becoming fair after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Low 73°. Wind north-northwest around 2 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Partly to mostly sunny. Moderate fog in the morning. A chance of rain. High 89°. Heat index up to 98°. UV index up to 9. Wind east-northeast around 3 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Fair to partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Low 73°. Wind east-southeast around 4 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. High 89°. Heat index up to 98°. UV index up to 9. Wind north-northwest around 8 mph, gusting to 19 mph, in the morning, becoming south in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Friday night	Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Low 72°. Wind west-southwest around 5 mph, gusting to 16 mph, in the evening, becoming northwest around 8 mph, gusting to 17 mph, after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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