North Issaquah Weather Forecast

    • 52
    • 71

    Slight Chance Thunderstorms

    • 52
    • 73

    Mostly Cloudy

    • 55
    • 75

    Partly Sunny

    • 56
    • 73

    Partly Sunny

    • 55
    • 74

    Partly Sunny

    • 57
    • 78

    Partly Sunny

Today 4 Sep Eastside

Partly sunny. A slight chance of rain early in the afternoon. A slight chance of Thunderstorms late in the afternoon. Highs near 70. Light wind.

Tonight 4 Sep Eastside

Mostly cloudy. Lows in the lower to mid 50s. Light wind.

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North Issaquah Temperature Statistics

September Temperature

Renton Municipal Airport (8.7 miles)

  • Lowest 1 September, 2026

    57.9 °F

  • Average September

    62.7 °F

  • Highest 1 September, 2026

    66.9 °F

Climate (2021–2026)

Renton Municipal Airport (8.7 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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