January in Tri-Cities averages a daily high of 5.5°C with nights around -2.1°C. Expect roughly 10 wet days totalling 24.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Tri-Cities is April–May.
Based on PASCO TRI CITIES AIRPORT, WA US (6.6km), 1995–2024. 26 years of January data.