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, 24-Sep-2026 04:00 pm

Tonight Fog	Friday Fog a.m.	Friday night Mostly Cloudy	Saturday Chance rain	Saturday night Fog late	Sunday Chance rain	Sunday night Fog late	Monday Fog a.m.
			.1 in.		.1 in.
Low: 53°	High: 71°	Low: 56°	High: 71°	Low: 56°	High: 72°	Low: 55°	High: 74°

NE 2-18 mph	ESE 4-16 mph	ENE 4-15 mph	ESE 3-17 mph	ESE 3 mph	ESE 3-15 mph	ESE 3 mph	ESE 4-17 mph
					UV: 5 Medium		UV: 4 Medium

Tonight	Partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. Low 53°. Wind northeast around 2 mph, gusting to 18 mph.
Friday	Mostly cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the morning. High 71°. Wind east-southeast around 4 mph, gusting to 16 mph.
Friday night	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 56°. Wind east-northeast around 4 mph, gusting to 15 mph.
Saturday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. High 71°. Wind east-southeast around 3 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Saturday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Low 56°. Wind east-southeast around 3 mph.
Sunday	Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 72°. UV index up to 5. Wind east-southeast around 3 mph, gusting to 15 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Sunday night	Fair to partly cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. Low 55°. Wind east-southeast around 3 mph.
Monday	Partly cloudy. Light to moderate fog in the morning. High 74°. UV index up to 4. Wind east-southeast around 4 mph, gusting to 17 mph.
Monday night	Partly cloudy. Patchy light fog after midnight. Low 56°. Wind southeast around 4 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Warm. High 80°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 16 mph.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Low 64°. Wind south-southeast around 4 mph in the evening, becoming southwest after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Wednesday	Dense overcast. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. High 73°. Wind south-southeast around 5 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Warm. Low 68°. Wind east-southeast around 7 mph in the evening, becoming south-southeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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