Hamilton Weather Forecast

    • 47
    • 66

    Slight Chance Rain

    • 50
    • 66

    Rain

    • 47
    • 58

    Rain

    • 44
    • 63

    Mostly Cloudy

    • 46
    • 66

    Partly Sunny

    • 47
    • 65

    Chance Rain

Today 23 Sep Foothills and Valleys of the North Cascades

Partly sunny. A slight chance of rain in the late morning and early afternoon. Highs in the 60s. Light wind.

Tonight 23 Sep Foothills and Valleys of the North Cascades

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid to upper 40s. Light wind.

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Hamilton Temperature Statistics

September Temperature

Burlington/Mount Vernon, Skagit Regional Airport (19.9 miles)

  • Lowest 16 September, 2026

    46.4 °F

  • Average September

    59.3 °F

  • Highest 9 September, 2026

    75.2 °F

Climate (2021–2026)

Burlington/Mount Vernon, Skagit Regional Airport (19.9 miles)

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  • Average Low 2021–2026

    43.8 °F

  • Average 2021–2026

    51.2 °F

  • Average High 2021–2026

    59.3 °F
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