Most of the festivals in Selfoss occur in summers when the weather is quite warm and pleasant.
- Summer in Selfoss: This festival is held each year in early August and has a lot of musicians, magicians, performers, local stalls and a fireworks show. The town people decorate their gardens with ribbons and within the festival a bigger national level event takes place usually.
- BBQ Festival Kotelettan: The BBQ festival usually occurs from 12th to 14th June and isn’t only about barbecuing meat. There are lots of musical performances and other merrymaking in the fest.