Grand Portage Lake Weather Forecast

    • 25
    • 35

    Wintry Mix

    • 22
    • 38

    Snow

    • 15
    • 33

    Chance Snow

    • 20
    • 40

    Mostly Cloudy

    • 23
    • 44

    Partly Sunny

    • 25
    • 46

    Chance Rain

Today 22 Mar Iron

Sunny, cooler with Highs in the mid 30s. Southwest Winds around 5 Mph.

Tonight 22 Mar Iron

Mostly cloudy. Snow with freezing rain likely after midnight. Little or no snow accumulation. Ice accumulation of up to a tenth of an inch. Not as cool with Lows in the mid 20s. South Winds around 5 Mph with Gusts up to 20 Mph, becoming southeast 10 to 15 Mph with Gusts up to 30 Mph after midnight. Chance of precipitation 80 percent.

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Grand Portage Lake Temperature Statistics

March Temperature

Manitowish Waters Airport (8.7 miles)

  • Lowest 2 March, 2025

    -10.7 °F

  • Average March

    29.7 °F

  • Highest 14 March, 2025

    64.8 °F

Climate (2020–Present)

Manitowish Waters Airport (8.7 miles)

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  • Average Low 2020–2025

    29.7 °F

  • Average 2020–2025

    40.5 °F

  • Average High 2020–2025

    50.1 °F
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