Lake Sammamish Weather Forecast

    • 53
    • 76

    Sunny

    • 52
    • 73

    Mostly Sunny

    • 52
    • 72

    Partly Sunny

    • 52
    • 73

    Mostly Sunny

    • 54
    • 74

    Partly Sunny

    • 52
    • 69

    Slight Chance Rain

Today 17 Sep Eastside

Sunny. Highs in the 70s. Light wind.

Tonight 17 Sep Eastside

Clear. Lows in the lower to mid 50s. Light wind.

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  • Temperature Real-Time

Lake Sammamish Temperature Statistics

September Temperature

Renton Municipal Airport (9.3 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    61.7 °F

  • Highest 9 September, 2026

    79 °F

Climate (2021–2026)

Renton Municipal Airport (9.3 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    62.2 °F
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