December in Beaverton averages a daily high of 7.7°C with nights around 2.9°C. Expect roughly 19.1 wet days totalling 198.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Beaverton is July–September.
Based on PORTLAND KGW TV, OR US (9.6km), 1995–2024. 29 years of December data.