Sammamish Weather Forecast

    • 58
    • 76

    Rain Likely

    • 54
    • 67

    Rain Likely

    • 53
    • 70

    Partly Sunny

    • 57
    • 82

    Mostly Sunny

    • 52
    • 74

    Chance Rain

    • 51
    • 69

    Chance Rain

Today 13 Sep Eastside

Mostly cloudy in the morning then becoming mostly sunny. Highs in the 70s. Light wind.

Tonight 13 Sep Eastside

Mostly cloudy until early Morning, then a slight chance of Showers in the morning. Lows near 60. Light wind.

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Sammamish Temperature Statistics

September Temperature

Renton Municipal Airport (11.8 miles)

  • Lowest 10 September, 2025

    57 °F

  • Average September

    67.3 °F

  • Highest 3 September, 2025

    82.9 °F

Climate (2020–Present)

Renton Municipal Airport (11.8 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    54.5 °F

  • Average High 2020–2025

    62.2 °F
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