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: Tuesday, 22-Sep-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Partly Cloudy	Thursday Mostly Sunny	Thursday night Partly Cloudy	Friday Mostly Cloudy	Friday night Mostly Cloudy
						<.1 in.
High: 78°	Low: 56°	High: 75°	Low: 53°	High: 76°	Low: 54°	High: 72°	Low: 56°

ENE 6-25 mph	ENE 6-24 mph	NNE 6-25 mph	NNE 4-22 mph	NNE 5-24 mph	NE 3-18 mph	E 4-18 mph	ENE 4-16 mph
UV: 6 High		UV: 6 High		UV: 7 High

Today	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 78°. UV index up to 6. Wind east-northeast around 6 mph, gusting to 25 mph.
Tonight	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 56°. Wind east-northeast around 6 mph, gusting to 24 mph.
Wednesday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 75°. UV index up to 6. Wind north-northeast around 6 mph, gusting to 25 mph.
Wednesday night	Fair to partly cloudy. Low 53°. Wind north-northeast around 4 mph, gusting to 22 mph.
Thursday	Partly to mostly sunny. High 76°. UV index up to 7. Wind north-northeast around 5 mph, gusting to 24 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 54°. Wind northeast around 3 mph, gusting to 18 mph.
Friday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain. High 72°. Wind east around 4 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 56°. Wind east-northeast around 4 mph, gusting to 16 mph.
Saturday	Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 76°. UV index up to 5. Wind east around 5 mph, gusting to 23 mph.
Saturday night	Mostly cloudy. Low 57°. Wind east around 5 mph, gusting to 20 mph.
Sunday	Mostly cloudy. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 73°. UV index up to 4. Wind east-southeast around 4 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday night	Cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Low 58°. Wind east-northeast around 5 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. High 76°. UV index up to 5. Wind east around 8 mph, gusting to 26 mph.
Monday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 59°. Wind southeast around 6 mph, gusting to 21 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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