There’s nothing like an all-inclusive holiday in Skagafjörour to refresh you, especially when you know what kind of weather to expect. Here’s some information to help you choose when to book: The hottest months are usually July and August, with an average temperature of 9°C, while the coldest months are December and January, with an average of -3°C. June and May are the driest months, while September and October are the rainiest months.