January in Kennewick averages a daily high of 5.5°C with nights around -1.3°C. Expect roughly 11.3 wet days totalling 29.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Kennewick is May–June.
Based on KENNEWICK, WA US (2.8km), 1995–2024. 30 years of January data.