Issaquah Highlands Weather Forecast

    • 64
    • 91

    Increasing Clouds

    • 61
    • 85

    Mostly Cloudy

    • 59
    • 81

    Partly Sunny

    • 58
    • 85

    Partly Sunny

    • 57
    • 79

    Partly Sunny

    • 56
    • 78

    Partly Sunny

Today 26 Aug Foothills and Valleys of Central King County

Mostly sunny. Highs near 90. Light wind.

Tonight 26 Aug Foothills and Valleys of Central King County

Mostly cloudy. Lows in the lower to mid 60s. Light wind.

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Issaquah Highlands Temperature Statistics

August Temperature

Renton Municipal Airport (10.6 miles)

  • Lowest 8 August, 2025

    52.6 °F

  • Average August

    69.9 °F

  • Highest 12 August, 2025

    92.6 °F

Climate (2020–Present)

Renton Municipal Airport (10.6 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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