Tacoma, Washington has a mild climate influenced by its proximity to the Pacific Ocean and the Cascade Mountains. Average Temperatures in Tacoma vary depending on the season. In the winter months, the average temperature ranges from the mid-30s to the mid-40s. In the summer months, the average temperature ranges from the mid-60s to the mid-70s, with occasional stretches in the 80s and 90s. Tacoma is known for its rainy weather, particularly during the fall and winter months. Living in Tacoma, you can expect an average of 40 inches of rainfall per year, with the most rain falling between October and March. The summer months are usually quite dry with little rain.