Plan your trip to the beach with a look at year-round temperatures in Seeon-Seebruck: The hottest months are usually July and August with an average temp of 62°F, while the coldest months are February and January with an average of 34°F. The snowiest months in Seeon-Seebruck are December, January, November, and February, with each month seeing an average of 5 inches of snowfall.