Winters in Sammamish are typically cool and sometimes quite chilly, with temperatures often below freezing. The coldest months are January and February, where temperatures can drop as low as -7°C and -14°C respectively. Spring is a gradual warming period, with March temperatures rising to around 16°C on average. Summer brings warmth, with July and August temperatures averaging around 18°C, but occasional heatwaves can push temperatures above 30°C. As autumn sets in, temperatures cool again, with October and November averages returning to around 8°C and 5°C respectively.