St. James State Marine Park is located approximately 35 miles northwest of Juneau and 45 miles south of Haines. The park encompasses St. James Bay, Boat harbor, and continues north up the valley which drains the area. The area has abundant protected anchorages, concentrations of fish and wildlife, and beach landing areas.

The average temperatures in the summer are in the 60's, rare highs hitting 80. High humidity and a high average rainfall make for a wet environment. The average rainfall is from 60-90 inches annually. Have warm clothing and quality rain gear, as inclement weather can set in quickly and last for days. Snow can begin to accumulate as early as October.