August in Corvallis averages a daily high of 29°C with nights around 11.1°C. Expect roughly 3 wet days totalling 9.3mm. Comfortable conditions for being outdoors all day.
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 August data.