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, 26-Mar-2026 05:00 am

Today Mostly Sunny	Tonight Thunder storm	Friday Mostly Cloudy	Friday night Mostly Clear	Saturday Sunny	Saturday night Partly Cloudy	Sunday Mostly Cloudy	Sunday night Partly Cloudy
	.25 in.
High: 96°	Low: 52°	High: 61°	Low: 37°	High: 61°	Low: 44°	High: 74°	Low: 47°

SW 11-32 mph	NNW 8-23→12-30 mph	N 12-31 mph	N 8-28→5-19 mph	E→SE 6-26 mph	SSE 7-24 mph	SSE 8-27 mph	S 9-23 mph
UV: 7 High		UV: 7 High		UV: 7 High		UV: 6 High

Today	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Near record heat. High 96°. UV index up to 7. Wind southwest around 11 mph, gusting to 32 mph.
Tonight	Partly to mostly cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Low 52°. Wind north-northwest around 8 mph, gusting to 23 mph, in the evening, becoming 12 mph, gusting to 30 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Friday	Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Breezy. High 61°. UV index up to 7. Wind north around 12 mph, gusting to 31 mph.
Friday night	Mostly clear. Low 37°. Wind north around 8 mph, gusting to 28 mph, in the evening, becoming 5 mph, gusting to 19 mph, after midnight.
Saturday	Sunny. High 61°. UV index up to 7. Wind east around 6 mph, gusting to 26 mph, in the morning, becoming southeast in the afternoon.
Saturday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 44°. Wind south-southeast around 7 mph, gusting to 24 mph.
Sunday	Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 74°. UV index up to 6. Wind south-southeast around 8 mph, gusting to 27 mph.
Sunday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 47°. Wind south around 9 mph, gusting to 23 mph.
Monday	Partly cloudy. Breezy and unusually hot. High 85°. UV index up to 7. Wind south-southwest around 11 mph, gusting to 30 mph.
Monday night	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Mild. Low 58°. Wind south-southwest around 11 mph, gusting to 22 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Breezy and exceptionally hot. High 88°. UV index up to 6. Wind south-southwest around 12 mph, gusting to 32 mph.
Tuesday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Breezy and mild. Low 62°. Wind south-southwest around 13 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Wednesday	Dense overcast. Patchy light fog. Rain likely. Thunderstorms very likely, some possibly severe. High 66°. Wind south-southwest around 7 mph, gusting to 22 mph, in the morning, becoming north in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Wednesday night	Dense overcast. Patchy light fog. Rain likely. Scattered thundershowers possible. Low 51°. Wind north-northeast around 7 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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