Weather is probably a major factor when you plan your trip to Giske, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 55°F, while the coldest months are February and January with an average of 38°F. The rainiest months in Giske are October, September, December, and January, with each month seeing an average of 10 inches of rainfall.