Sammamish Weather Forecast

    • 54
    • 73

    Increasing Clouds

    • 53
    • 69

    Mostly Cloudy

    • 53
    • 73

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

    • 56
    • 77

    Partly Sunny

    • 54
    • 72

    Chance Rain

Today 6 Sep Eastside

Mostly sunny. Highs in the lower to mid 70s. Light wind.

Tonight 6 Sep Eastside

Partly cloudy. Lows in the 50s. Light wind.

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Sammamish Temperature Statistics

September Temperature

Renton Municipal Airport (11.8 miles)

  • Lowest 3 September, 2026

    54 °F

  • Average September

    60.8 °F

  • Highest 2 September, 2026

    69.1 °F

Climate (2021–2026)

Renton Municipal Airport (11.8 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    62.2 °F
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