Mercer Slough Nature Park Weather Forecast

    • 54
    • 74

    Decreasing Clouds

    • 53
    • 74

    Partly Sunny

    • 55
    • 73

    Partly Sunny

    • 53
    • 70

    Partly Sunny

    • 53
    • 69

    Mostly Cloudy

    • 54
    • 71

    Chance Rain

Today 19 Sep Eastside

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

Tonight 19 Sep Eastside

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

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Mercer Slough Nature Park Temperature Statistics

September Temperature

Renton Municipal Airport (6.2 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    61.8 °F

  • Highest 9 September, 2026

    79 °F

Climate (2021–2026)

Renton Municipal Airport (6.2 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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