October in Corvallis averages a daily high of 18.3°C with nights around 5.7°C. Expect roughly 15.2 wet days totalling 87.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Corvallis is June–September.
Based on CORVALLIS STATE UNIVERSITY, OR US (9.6km), 1995–2024. 30 years of October data.