A Sunny Day in Glasgow began as a collaboration between friends Ben Daniels and Ever Nalens, both of whom had recently returned to Philadelphia after several years in the UK. The band name came from Nalens, who had been living in Glasgow, and Daniels kept it after Nalens left the project. Daniels also asked his twin sisters, Robin and Lauren, to start singing on the songs they had been working on.
In March 2006 the band collected several songs and released them as an EP titled, The Sunniest Day Ever. The EP received attention from College Radio, charting #1 on NYU's WNYU, as well as music blogs, with Pitchfork Mediacontributing an early, favorable review.
In the Fall of 2006 the band signed to Notenuf Records and eventually released their debut LP, Scribble Mural Comic Journal in February 2007.The record received widespread critical acclaim with Pitchfork Media giving the record an "8.0"Drowned in Sound gave the album a "9/10"
On June 24, 2014 they plan to release their album 'Sea When Absent'.