Lake Armstrong Weather Forecast

    • 33
    • 50

    Rain

    • 32
    • 54

    Chance Rain

    • 31
    • 53

    Chance Rain

    • 32
    • 55

    Mostly Cloudy

    • 32
    • 55

    Partly Sunny

    • 35
    • 56

    Mostly Cloudy

    • 34
    • 58

    Partly Sunny

Today 28 Oct Lowlands of Western Skagit and Northwestern Snohomish Counties

Partly sunny. Highs in the mid to upper 50s.

Tonight 28 Oct Lowlands of Western Skagit and Northwestern Snohomish Counties

Mostly cloudy with rain likely in the Evening, then mostly cloudy with a chance of rain after midnight. Rainfall Amounts a tenth to a quarter of an inch possible. Lows in the mid 30s to lower 40s. Southeast wind 10 to 20 Mph.

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Lake Armstrong Temperature Statistics

October Temperature

Arlington Municipal Airport (4.3 miles)

  • Lowest 12 October, 2026

    32 °F

  • Average October

    51.4 °F

  • Highest 16 October, 2026

    78.1 °F

Climate (2021–2026)

Arlington Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    60 °F
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