December in Eugene averages a daily high of 8.1°C with nights around 1.6°C. Expect roughly 19 wet days totalling 180.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Eugene is June–September.
Based on EUGENE MAHLON SWEET FIELD, OR US (13.7km), 1995–2024. 30 years of December data.