Olson Lake Weather Forecast

    • 56
    • 71

    Chance Rain

    • 54
    • 73

    Chance Rain

    • 54
    • 69

    Rain Likely

    • 54
    • 72

    Chance Rain

    • 55
    • 72

    Partly Sunny

    • 54
    • 73

    Chance Rain

    • 55
    • 76

    Chance Rain

Today 7 Sep Foothills and Valleys of the North Cascades

Mostly cloudy. Areas of smoke in the morning. A slight chance of Showers in the Morning, then a chance of Showers and a slight chance of Thunderstorms in the afternoon. Highs in the upper 60s to mid 70s. Light wind.

Tonight 7 Sep Foothills and Valleys of the North Cascades

Mostly cloudy. A slight chance of rain in the Evening, then a chance of rain after midnight. Lows in the mid to upper 50s. Light wind.

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Olson Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (3.1 miles)

  • Lowest 3 September, 2025

    55 °F

  • Average September

    64.8 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Arlington Municipal Airport (3.1 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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