Weather will likely play an important role when you plan your trip to Borgarfjordur Eystri, but bear 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 temperature of 9°C, while the coldest months are December and January, with an average of 0°C. The rainiest months in Borgarfjordur Eystri are November, October, December and September, with each month seeing an average of 180 mm of rainfall.