March in Renton averages a daily high of 12.3°C with nights around 4.2°C. Expect roughly 16.8 wet days totalling 82.9mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Renton is July–August.
Based on RENTON MUNICIPAL AIRPORT, WA US (1.4km), 1995–2024. 26 years of March data.