December in Federal Way averages a daily high of 8.5°C with nights around 2.9°C. Expect roughly 21.1 wet days totalling 167.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Federal Way is July–September.
Based on TACOMA NUMBER 1, WA US (11.2km), 1995–2024. 27 years of December data.