Do You Remember the 21st Night of September? These Couples Will.

September may be the new June, at least when it comes to weddings.

Historically June has been the top pick for nuptials — after all, it’s the start of summer. But it’s still officially summer until Sept. 22, and the day before is shaping up to be an especially busy day for getting married.

Sept. 21 is a favorite date because of the enduringly popular Earth, Wind & Fire song “September,” wedding planning sites, event planners and hotels that host receptions say. The catchy ballad opens with the lyrics, “Do you remember the 21st night of September? Love was changin’ the minds of pretenders, while chasin’ the clouds away.”

According to the wedding platform Zola, nearly 13,000 couples signed up for its site indicating that they were getting married on Saturday, Sept. 21, 2024, a 33 percent increase from the same date in 2019, also a Saturday.

Allison Cullman, Zola’s vice president for brand marketing and strategy, attributed the jump, at least in part, to “September.” “This song is a go-to for celebrations, so it could be giving couples a little nudge to pick this date for their big day,” she said. “Pop culture can influence wedding dates.”

Ms. Cullman noted that Sept. 28, also a Saturday, is another popular day for weddings because of Taylor Swift. The singer released an iteration of “September” in 2018, but changed the date to the 28th. (Ms. Swift’s fans say it was most likely a reference to her relationship with the actor Joe Alwyn, which started on Sept. 28.)