April in Corvallis averages a daily high of 16°C with nights around 4°C. Expect roughly 17.3 wet days totalling 83.6mm. 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. 29 years of April data.