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, 26-Sep-2026 04:00 pm

Tonight Mostly Cloudy	Sunday Partly Cloudy	Sunday night Fog late	Monday Fog a.m.	Monday night Partly Cloudy	Tuesday Partly Cloudy	Tuesday night Partly Cloudy	Wednesday Cloudy
							<.1 in.
Low: 54°	High: 76°	Low: 52°	High: 77°	Low: 53°	High: 81°	Low: 58°	High: 79°

E 3 mph	ENE 3-23 mph	NE 3-16 mph	NE 3-21 mph	ENE→ESE 3 mph	SE 5-22 mph	SSE 6-15 mph	SSW→ENE 3 mph
	UV: 6 High		UV: 6 High		UV: 5 Medium

Tonight	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 54°. Wind east around 3 mph.
Sunday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 76°. UV index up to 6. Wind east-northeast around 3 mph, gusting to 23 mph.
Sunday night	Fair in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 52°. Wind northeast around 3 mph, gusting to 16 mph.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Warm. High 77°. UV index up to 6. Wind northeast around 3 mph, gusting to 21 mph.
Monday night	Fair to partly cloudy. Low 53°. Wind east-northeast around 3 mph in the evening, becoming east-southeast after midnight.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 81°. UV index up to 5. Wind southeast around 5 mph, gusting to 22 mph.
Tuesday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 58°. Wind south-southeast around 6 mph, gusting to 15 mph.
Wednesday	Cloudy. A chance of rain. Precipitation showery or intermittent. Warm. High 79°. Wind south-southwest around 3 mph in the morning, becoming east-northeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 64°. Wind northeast around 2 mph in the evening, becoming south after midnight.
Thursday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Precipitation showery or intermittent. Warm. High 83°. UV index up to 5. Wind southwest around 3 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 63°. Wind north-northeast around 4 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Friday	Dense overcast in the morning, becoming 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 thundershowers possible. Warm. High 78°. Wind south around 4 mph, gusting to 15 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Warm. Low 67°. Wind southwest around 2 mph in the evening, becoming south after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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