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, 29-Aug-2026 04:00 pm

Tonight Partly Cloudy	Sunday Mostly Sunny	Sunday night Clear	Monday Partly Cloudy	Monday night Partly Cloudy	Tuesday Sunny Hot!	Tuesday night Clear	Wednesday Sunny Hot!

Low: 65°	High: 94°	Low: 69°	High: 98°	Low: 70°	High: 100°	Low: 71°	High: 100°
					Heat: 105°		Heat: 107°
SSW 6-22 mph	SSW 7-23 mph	SSE 6-17 mph	SSW 7-23 mph	SSW 5-16 mph	SSW 5-22 mph	S 4 mph	SSW 6-23 mph
	UV: 8 Very High		UV: 8 Very High		UV: 8 Very High		UV: 8 Very High

Tonight	Partly cloudy in the evening, becoming clear after midnight. Low 65°. Wind south-southwest around 6 mph, gusting to 22 mph.
Sunday	Partly to mostly sunny. Very hot. High 94°. UV index up to 8. Wind south-southwest around 7 mph, gusting to 23 mph.
Sunday night	Clear in the evening, becoming fair after midnight. Low 69°. Wind south-southeast around 6 mph, gusting to 17 mph.
Monday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Very hot. High 98°. UV index up to 8. Wind south-southwest around 7 mph, gusting to 23 mph.
Monday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 70°. Wind south-southwest around 5 mph, gusting to 16 mph.
Tuesday	Sunny. Extremely hot. High 100°. Heat index up to 105°. UV index up to 8. Wind south-southwest around 5 mph, gusting to 22 mph.
Tuesday night	Clear. Low 71°. Wind south around 4 mph.
Wednesday	Sunny. Extremely hot. High 100°. Heat index up to 107°. UV index up to 8. Wind south-southwest around 6 mph, gusting to 23 mph.
Wednesday night	Clear. Low 72°. Wind south-southwest around 3 mph.
Thursday	Sunny. Extremely hot. High 101°. Heat index up to 109°. UV index up to 8. Wind southwest around 5 mph, gusting to 21 mph.
Thursday night	Mostly clear in the evening, becoming fair after midnight. Low 73°. Wind southeast around 2 mph in the evening, becoming south after midnight.
Friday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Extremely hot. High 100°. Heat index up to 109°. UV index up to 7. Wind southwest around 5 mph, gusting to 21 mph.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Warm. Low 74°. Wind southeast around 4 mph in the evening, becoming southwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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