In August, Sammamish typically sees daytime highs of 23.4°C and overnight lows around 12.1°C. Compared to the annual average high of 15.1°C, August runs +8.4°C.
August in Sammamish averages a daytime high of 23.4°C and an overnight low of 12.1°C.
August runs +8.4°C compared to Sammamish's annual average high of 15.1°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 23.4°C and cooler evenings around 12.1°C.