The Blue Lagoon is one of Iceland's most popular attractions, and it's little wonder as to why. The beautiful milky-blue water is unlike anything else found on earth and starkly contrasts with the surrounding black lava fields and creeping gray moss. The temperature of the Blue Lagoon is a consistent 102 F (39 C) year-round, making it the perfect bathing temperature. Recommend you book your ticket online and enjoy your relaxing time there!