Weather is probably a major factor when you plan your trip to Vik I Myrdal, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 49°F, while the coldest months are December and January with an average of 30°F. The rainiest months in Vik I Myrdal are September, February, October, and January, with each month seeing an average of 9 inches of rainfall.