Frontier Airpark Weather Forecast

    • 51
    • 69

    Decreasing Clouds

    • 55
    • 86

    Mostly Sunny

    • 48
    • 75

    Partly Sunny

    • 49
    • 71

    Mostly Sunny

    • 51
    • 75

    Mostly Sunny

    • 52
    • 75

    Chance Rain

Today 15 Sep Foothills and Valleys of the North Cascades

Partly sunny in the morning then becoming sunny. Patchy fog in the morning. Highs in the upper 60s to mid 70s. Light wind.

Tonight 15 Sep Foothills and Valleys of the North Cascades

Mostly clear. Lows in the lower to mid 50s. Light wind.

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Frontier Airpark Temperature Statistics

September Temperature

Arlington Municipal Airport (5.6 miles)

  • Lowest 9 September, 2025

    51.8 °F

  • Average September

    63.3 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Arlington Municipal Airport (5.6 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    59.7 °F
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