Lake Chaplain Weather Forecast

    • 42
    • 61

    Mostly Cloudy

    • 46
    • 65

    Mostly Sunny

    • 44
    • 70

    Partly Sunny

    • 41
    • 57

    Rain Likely

    • 38
    • 53

    Slight Chance Rain

    • 41
    • 57

    Chance Rain

Today 19 Oct Foothills and Valleys of Snohomish and Northern King Counties

Mostly cloudy. Patchy fog in the morning. Highs in the mid 50s to lower 60s. Light wind.

Tonight 19 Oct Foothills and Valleys of Snohomish and Northern King Counties

Mostly cloudy. Patchy fog after midnight. Lows in the upper 30s to mid 40s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Chaplain Temperature Statistics

October Temperature

Arlington Municipal Airport (19.9 miles)

  • Lowest 12 October, 2026

    32 °F

  • Average October

    54 °F

  • Highest 16 October, 2026

    78.1 °F

Climate (2021–2026)

Arlington Municipal Airport (19.9 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    60 °F
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