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, 06-Oct-2026 04:00 pm

Tonight Clear	Wednesday Sunny	Wednesday night Partly Cloudy	Thursday Sunny	Thursday night Clear	Friday Sunny	Friday night Clear	Saturday Partly Cloudy

Low: 53°	High: 84°	Low: 54°	High: 81°	Low: 51°	High: 84°	Low: 54°	High: 85°

SSE→SSW 4-19 mph	WSW 6-24 mph	NNW 3 mph	NNE 2-20 mph	ENE→ESE 4 mph	SSE 7-24 mph	SSE 6-15 mph	SSE 5-17→8-23 mph
	UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Tonight	Clear. Low 53°. Wind south-southeast around 4 mph, gusting to 19 mph, in the evening, becoming south-southwest after midnight.
Wednesday	Sunny. Unusually hot. High 84°. UV index up to 5. Wind west-southwest around 6 mph, gusting to 24 mph.
Wednesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 54°. Wind north-northwest around 3 mph.
Thursday	Sunny. Warm. High 81°. UV index up to 5. Wind north-northeast around 2 mph, gusting to 20 mph.
Thursday night	Clear. Low 51°. Wind east-northeast around 4 mph in the evening, becoming east-southeast after midnight.
Friday	Sunny. Unusually hot. High 84°. UV index up to 5. Wind south-southeast around 7 mph, gusting to 24 mph.
Friday night	Clear. Low 54°. Wind south-southeast around 6 mph, gusting to 15 mph.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Unusually hot. High 85°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 17 mph, in the morning, becoming 8 mph, gusting to 23 mph, in the afternoon.
Saturday night	Mostly cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Mild. Low 63°. Wind south-southeast around 6 mph, gusting to 19 mph, in the evening, becoming east after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday	Dense overcast in the morning, becoming mostly cloudy to 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. Warm. High 75°. Wind north-northeast around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday night	Fair to partly cloudy. Patchy light fog after midnight. Low 58°. Wind north around 1 mph, gusting to 18 mph, in the evening, becoming west-northwest after midnight.
Monday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Warm. High 80°. UV index up to 4. Wind east-northeast around 3 mph, gusting to 22 mph.
Monday night	Clear. Patchy light fog. Low 55°. Wind south-southeast around 2 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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