May in Kennewick averages a daily high of 24°C with nights around 10.2°C. Expect roughly 6.3 wet days totalling 19.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Kennewick is May–June.
Based on KENNEWICK, WA US (2.8km), 1995–2024. 30 years of May data.