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, 27-Aug-2026 05:00 am

Today Sunny	Tonight Clear	Friday Sunny	Friday night Partly Cloudy	Saturday Partly Cloudy	Saturday night Partly Cloudy	Sunday Partly Cloudy	Sunday night Mostly Clear

High: 85°	Low: 60°	High: 84°	Low: 59°	High: 89°	Low: 65°	High: 95°	Low: 68°

NNW 5-24 mph	NNE 3-18 mph	NNE 3-22 mph	E 3-15 mph	SSE 4-22 mph	SSE 6-17 mph	SSE 7-24 mph	S 7-19 mph
UV: 7 High		UV: 7 High		UV: 7 High		UV: 8 Very High

Today	Sunny. High 85°. UV index up to 7. Wind north-northwest around 5 mph, gusting to 24 mph.
Tonight	Clear. Relatively cool. Low 60°. Wind north-northeast around 3 mph, gusting to 18 mph.
Friday	Sunny. High 84°. UV index up to 7. Wind north-northeast around 3 mph, gusting to 22 mph.
Friday night	Fair to partly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 59°. Wind east around 3 mph, gusting to 15 mph.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 89°. UV index up to 7. Wind south-southeast around 4 mph, gusting to 22 mph.
Saturday night	Fair to partly cloudy. Low 65°. Wind south-southeast around 6 mph, gusting to 17 mph.
Sunday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Very hot. High 95°. UV index up to 8. Wind south-southeast around 7 mph, gusting to 24 mph.
Sunday night	Mostly clear. Low 68°. Wind south around 7 mph, gusting to 19 mph.
Monday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Very hot. High 96°. Heat index up to 100°. UV index up to 7. Wind south-southwest around 7 mph, gusting to 21 mph.
Monday night	Fair in the evening, becoming clear after midnight. Low 69°. Wind south-southwest around 6 mph.
Tuesday	Sunny. Very hot. High 98°. Heat index up to 104°. UV index up to 8. Wind south-southwest around 7 mph, gusting to 21 mph.
Tuesday night	Clear. Low 71°. Wind south-southwest around 7 mph.
Wednesday	Sunny. Near record heat. High 103°. Heat index up to 108°. UV index up to 8. Wind west-southwest around 10 mph, gusting to 25 mph.
Wednesday night	Fair in the evening, becoming clear after midnight. Low 72°. Wind south-southwest around 8 mph, gusting to 15 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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