May in Eugene averages a daily high of 19.9°C with nights around 6.7°C. Expect roughly 11.7 wet days totalling 56.7mm. Comfortable conditions for being outdoors all day.
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 May data.