July in Sammamish averages a daily high of 25.2°C with nights around 13.8°C. Expect roughly 4.6 wet days totalling 14.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Sammamish is July–August.
Based on SEATTLE SAND POINT WEATHER FORECAST OFFICE, WA US (14km), 1995–2024. 28 years of July data.