Irvine Slough Weather Forecast

    • 35
    • 43

    Mostly Cloudy

    • 35
    • 47

    Mostly Cloudy

    • 36
    • 48

    Mostly Cloudy

    • 38
    • 49

    Mostly Cloudy

    • 40
    • 50

    Chance Rain

    • 40
    • 50

    Chance Rain

    • 39
    • 49

    Chance Rain/Snow

Today 28 Dec Lowlands of Western Skagit and Northwestern Snohomish Counties

Partly sunny. Highs in the upper 30s to mid 40s. Light wind.

Tonight 28 Dec Lowlands of Western Skagit and Northwestern Snohomish Counties

Mostly cloudy. Lows in the 30s. Light wind.

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Irvine Slough Temperature Statistics

December Temperature

Arlington Municipal Airport (10.6 miles)

  • Lowest 1 December, 2025

    30 °F

  • Average December

    45.6 °F

  • Highest 15 December, 2025

    60.1 °F

Climate (2020–Present)

Arlington Municipal Airport (10.6 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    59.8 °F
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