probably because it fits the theme of late summer pretty well. There's a bunch of musical festivals and events that are bringing in the last few days of the season, and this song kind of embodies the last etchings of the summer party atmosphere before the schools/colleges/unis are back in session and normality resumes.
Also, it's in several movies and people who aren't radio listeners may have shown interest in the song I.E. via Itunes downloads/increased Youtube hits since it's been featured further increasing its popularity. Radio stations will strive to play what is popular at the present time.
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