August in Bellevue averages a daily high of 25.2°C with nights around 14.1°C. Expect roughly 5.8 wet days totalling 25.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Bellevue is July–August.
Based on SEATTLE SAND POINT WEATHER FORECAST OFFICE, WA US (9.5km), 1995–2024. 29 years of August data.