Joe Alwyn helped Taylor Swift and Jack Antonoff produce "august." Swift and Antonoff wrote and produced the song, with Alwyn also credited as a producer. Alwyn used the pseudonym William Bowery on Folklore and Evermore songwriting credits, but the "august" article lists him by name among the producers.
Antonoff first created the instrumental and sent it to Swift. According to the song's documented background, Swift wrote the lyrics quickly and intuitively after hearing the track. Their collaboration continued a partnership that had already produced songs on 1989, Reputation, and Lover.
Alwyn's credit is easy to confuse with Aaron Dessner's role on Folklore. Dessner was another central collaborator on the album and participated in its Grammy performance, but he is not listed as a producer of "august." The song's production credits are specifically Swift, Antonoff, and Alwyn.