South Fork Tolt Reservoir Weather Forecast

    • 43
    • 59

    Increasing Clouds

    • 48
    • 59

    Increasing Clouds

    • 45
    • 53

    Rain

    • 45
    • 57

    Partly Sunny

    • 47
    • 63

    Mostly Cloudy

    • 47
    • 61

    Partly Sunny

    • 47
    • 63

    Mostly Sunny

Today 27 Sep Cascades of Snohomish and Northern King Counties

Sunny. Freezing level near 14000 feet. Afternoon pass Temperatures in the lower 60s.

Tonight 27 Sep Cascades of Snohomish and Northern King Counties

Mostly clear. Freezing level near 9500 feet. Lows in the upper 30s. Light wind.

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  • Temperature Real-Time

South Fork Tolt Reservoir Temperature Statistics

September Temperature

Renton Municipal Airport (29.2 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    61.1 °F

  • Highest 9 September, 2026

    79 °F

Climate (2021–2026)

Renton Municipal Airport (29.2 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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