Weather will likely play an important role when you plan your trip to Hyder, 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 53°F, while the coldest months are December and February with an average of 24°F. The rainiest months in Hyder are November, October, January, and September, with each month seeing an average of 15 inches of rainfall.