August in Renton averages a daily high of 25.6°C with nights around 14.7°C. Expect roughly 4.5 wet days totalling 20.2mm. Comfortable conditions for being outdoors all day.
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 August data.