March in Tri-Cities averages a daily high of 15.1°C with nights around 0.6°C. Expect roughly 7.2 wet days totalling 16.2mm. Generally workable, with some weather to plan around.
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. 27 years of March data.