 In early August, the town holds a festival called "Sumar á Selfossi", meaning "Summer in Selfoss".Local residents decorate their gardens with ribbons, coloured according to neighbourhood, and a fete is held on the public grassland behind the civic library.The fete involves the selling of homemade goods on small stalls, performances by musicians and magicians on a temporary stage, and in 2011, a "Strongest Man" competition was held, with video recording by Icelandic television channel Stöð 2.