Taking into account the local weather in Sitka is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 53°F, while the coldest months are February and March with an average of 31°F. The snowiest months in Sitka are February, December, January, and March, with each month seeing an average of 10 inches of snowfall.