Heavy fog is common in July and August. Winds of up to 60-70 MPH may occur between December and March. The Nushagak River is ice-free from June through November. Dillingham's water is derived from three deep wells. Over one-half of homes use individual wells.
Sewage is collected by pipe, deposited and treated in a sewage lagoon.
Residents outside of the townsite use individual systems. Dillingham Refuse Inc., a private firm, collects refuse three times a week. The Senior Center collects aluminum for recycling, and NAPA recycles used batteries. The Chamber of Commerce coordinates recycling of several materials, including fishing web. A new landfill site with a baling facility is currently being planned.