Hamilton Weather Forecast

    • 46
    • 61

    Chance Rain

    • 47
    • 66

    Mostly Cloudy

    • 52
    • 68

    Mostly Cloudy

    • 50
    • 70

    Slight Chance Rain

    • 52
    • 75

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

    • 51
    • 71

    Mostly Cloudy

Today 29 Sep Foothills and Valleys of the North Cascades

Partly sunny. Highs in the mid to upper 60s.

Tonight 29 Sep Foothills and Valleys of the North Cascades

Mostly cloudy with a chance of rain in the Evening, then mostly cloudy with a slight chance of rain late in the evening. Mostly cloudy after midnight. Patchy fog in the evening. Patchy fog late in the night. Lows in the 40s. Light wind.

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Hamilton Temperature Statistics

September Temperature

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

  • Lowest 27 September, 2026

    41 °F

  • Average September

    58.3 °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

    59.2 °F
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