May in Marysville averages a daily high of 18.5°C with nights around 8.2°C. Expect roughly 13.7 wet days totalling 67.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Marysville is July–August.
Based on EVERETT, WA US (8.6km), 1995–2024. 26 years of May data.