Broadway musical “Sister Act” has mapped out its exit plan, with the tuner sticking around to take advantage of summer tourist business prior to an Aug. 26 closing.

Show, which began its 16-month run in March 2011, has spent most of its Main Stem lifespan logging middling numbers. Along with “Priscilla Queen of the Desert,” which shutters Sunday, “Sister Act” was one of two big-title musicals that opened in spring 2011 and consistently posted middle-of-the-pack sales, never building up enough momentum to cement a longstanding spot on the Rialto.

Musical got a bit of a sales boost when new topliner Raven-Symone joined the cast in late March, and has since mostly hovered in a range between $650,000 and $750,000 per week. Last week the production pulled in $665,000 and played to houses at 66% of capacity.

Following the show’s Broadway closing, the title will hit the road in October with a North American tour that launches in Toronto. Upcoming stagings are planned in France, Germany and Holland, among others countries, joining the trio of Euro productions now running in Hamburg, Vienna and on the road in the U.K.

Produced by Whoopi Goldberg and Euro legit giant Stage Entertainment, “Sister Act” vacates the Broadway Theater just ahead of the annual B.O. slowdown that hits the Main Stem every September when when summer vacation ends and tourism dries up.