Arlington Weather Forecast

    • 41
    • 66

    Increasing Clouds

    • 51
    • 67

    Rain

    • 45
    • 61

    Rain

    • 44
    • 65

    Partly Sunny

    • 47
    • 68

    Partly Sunny

    • 46
    • 67

    Partly Sunny

    • 46
    • 68

    Partly Sunny

Today 27 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Mostly sunny. Highs in the mid to upper 60s.

Tonight 27 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Partly cloudy. Lows in the 40s to lower 50s. Northwest wind to 10 Mph becoming southeast after midnight.

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Arlington Temperature Statistics

September Temperature

Arlington Municipal Airport (3.1 miles)

  • Lowest 24 September, 2026

    43 °F

  • Average September

    58.5 °F

  • Highest 9 September, 2026

    78.1 °F

Climate (2021–2026)

Arlington Municipal Airport (3.1 miles)

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  • Average Low 2021–2026

    42.6 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.9 °F
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