Grand Portage National Monument Weather Forecast

    • 46
    • 74

    Mostly Sunny

    • 45
    • 73

    Partly Sunny

    • 52
    • 71

    Mostly Cloudy

    • 55
    • 75

    Slight Chance Thunderstorms

    • 50
    • 74

    Chance Rain Showers

    • 50
    • 71

    Partly Sunny

    • 54
    • 72

    Mostly Cloudy

Today 18 Aug Southern Cook/North Shore

Mostly sunny. Near steady temperature in the lower 70s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 18 Aug Southern Cook/North Shore

Mostly clear. Cold with Lows in the mid 40s. Northwest Winds 5 to 10 Mph.

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Grand Portage National Monument Temperature Statistics

August Temperature

Grand Marais/Cook County Airport (31.7 miles)

  • Lowest 3 August, 2026

    48.2 °F

  • Average August

    62.7 °F

  • Highest 1 August, 2026

    77 °F

Climate (2021–2026)

Grand Marais/Cook County Airport (31.7 miles)

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  • Average Low 2021–2026

    28.7 °F

  • Average 2021–2026

    38.1 °F

  • Average High 2021–2026

    46.6 °F
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