South Fork Tolt Reservoir Weather Forecast

    • 34
    • 46

    Increasing Clouds

    • 30
    • 43

    Partly Sunny

    • 28
    • 41

    Sunny

    • 29
    • 43

    Mostly Sunny

    • 32
    • 43

    Partly Sunny

    • 35
    • 44

    Chance Rain/Snow

    • 38
    • 47

    Chance Rain/Snow

Today 21 Jan Cascades of Snohomish and Northern King Counties

Sunny. Freezing level near 7500 feet. Afternoon pass Temperatures in the lower 30s. Light wind.

Tonight 21 Jan Cascades of Snohomish and Northern King Counties

Partly cloudy until early morning then becoming mostly cloudy. Freezing level near 6500 feet. Lows in the lower 20s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Fork Tolt Reservoir Temperature Statistics

January Temperature

Renton Municipal Airport (29.2 miles)

  • Lowest 18 January, 2026

    30.9 °F

  • Average January

    44.7 °F

  • Highest 13 January, 2026

    59 °F

Climate (2021–Present)

Renton Municipal Airport (29.2 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    62.2 °F
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