Riley Lake Weather Forecast

    • 38
    • 65

    Mostly Sunny

    • 44
    • 61

    Rain Showers

    • 40
    • 60

    Rain Showers Likely

    • 44
    • 59

    Rain

    • 41
    • 56

    Rain

    • 40
    • 57

    Chance Rain Showers

    • 42
    • 58

    Chance Rain Showers

Today 15 Oct Foothills and Valleys of the North Cascades

Sunny. Highs in the upper 50s to mid 60s. Light wind.

Tonight 15 Oct Foothills and Valleys of the North Cascades

Mostly clear. Lows near 40. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Riley Lake Temperature Statistics

October Temperature

Arlington Municipal Airport (11.2 miles)

  • Lowest 13 October, 2025

    35.6 °F

  • Average October

    53.2 °F

  • Highest 7 October, 2025

    73.9 °F

Climate (2020–Present)

Arlington Municipal Airport (11.2 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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