The 25-year-old musician took to Twitter to make the announcement.
He captioned the photograph, "Morning London", which showed Smith's picture plastered on a hoarding with 'September 8' visible on it.
Earlier, the "Stay With Me" singer had shared a note on social media, where he thanked his fans and followers for letting him take some time off the music scene.
"First of all, I want to say thank you. Thank you for being so patient and for letting me have the past year to really escape into my mind and write music so freely. I feel so rejuvenated and have so many stories I can't wait to tell you.
Smith released his debut album, 'In the Lonely Hour' in 2014.