Thunder Arm Weather Forecast

    • 55
    • 72

    Increasing Clouds

    • 53
    • 69

    Increasing Clouds

    • 56
    • 70

    Chance Rain

    • 57
    • 66

    Rain Likely

    • 53
    • 63

    Rain Likely

    • 55
    • 69

    Partly Sunny

    • 58
    • 75

    Mostly Sunny

Today 3 Aug Foothills and Valleys of the North Cascades

Partly sunny. Highs in the 70s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 3 Aug Foothills and Valleys of the North Cascades

Mostly cloudy. Lows in the lower to mid 50s. West wind to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Thunder Arm Temperature Statistics

August Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 1 August, 2025

    57.9 °F

  • Average August

    67 °F

  • Highest 1 August, 2025

    79 °F

Climate (2020–Present)

Arlington Municipal Airport (60.9 miles)

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  • Average Low 2020–2025

    42.3 °F

  • Average 2020–2025

    50.5 °F

  • Average High 2020–2025

    59.7 °F
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