The Blue Lagoon is one of Iceland’s most popular tourists destinations and you’ll see the steam rising from the horizon as you make your way from Kefairport into Reykjavik. The water temperature stays a constant 40C (104F) throughout the year, even during the dark winter months. The added cold makes the warm waters even more enjoyable and the small December crowds are another reason you can and should visit Iceland in the winter.
Just be careful and watch your step as you hurry from the showers out to the lagoon, it’s extremely slippery. Also, as is the case with the hot tap water in Iceland, the Blue Lagoon does not have a distinctive rotten egg smell (caused by sulfur). You can see some more of my pictures from the Blue Lagoon and Reykjavik here.