January in Corvallis averages a daily high of 8.7°C with nights around 1.5°C. Expect roughly 21.8 wet days totalling 173.2mm. A hard month to visit for comfort alone.
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 January data.