Winters in Bothell are cool and sometimes chilly, with temperatures ranging from -8°C to 14°C. Spring is mild and gradually warming up, with temperatures increasing from near-freezing to warm days above 20°C. Summer brings warmth and occasional heatwaves, with temperatures often reaching the mid-30s Celsius. Autumn is generally cooler than summer, with temperatures dropping back down into single digits at night and highs in the late teens and early twenties. In general, Bothell's temperature remains relatively mild throughout the year, rarely experiencing extreme cold or heat.