The company claims the Cascada's first-half sales outpaced the Audi A3 convertible and A5 convertible combined.
General Motors has already expanded its Buick Cascada range with a new Sport Touring edition.
The ST package is easy to spot, thanks to its exclusive True Blue Metallic exterior paint and new five-spoke 20-inch wheels. On the interior, drivers are treated to Black Magic trim components, sport pedals and a flat-bottom steering wheel.
The Sport Touring variant was quietly unveiled this past weekend during the fifth annual Mille Mitten rally, showcasing Buick's drop-top model on a 1,000-mile road trip in northern Michigan.
The Cascada ST carries a $37,885 price tag (including freight), representing a nearly $4,000 premium over the base model or nearly $900 above the similarly-equipped Premium package.
Despite pushing just 633 units in the US last monght, GM suggests the Cascada has exceeded expectations. The company claims first-half sales outpaced the Audi A3 convertible and A5 convertible combined.