Lake Superior Weather Forecast

    • 56
    • 66

    Increasing Clouds

    • 53
    • 59

    Mostly Cloudy

    • 54
    • 58

    Mostly Cloudy

    • 57
    • 60

    Chance Rain Showers

    • 57
    • 61

    Chance Rain Showers

    • 55
    • 62

    Chance Rain Showers

Today 17 Sep Southern Cook/North Shore

Patchy fog this morning. Mostly sunny. Highs in the lower 70s. Northwest Winds around 5 Mph.

Tonight 17 Sep Southern Cook/North Shore

Mostly cloudy. Lows in the lower 50s. North Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Superior Temperature Statistics

September Temperature

Grand Marais, The Bay of Grand Marais (28 miles)

  • Lowest 3 September, 2025

    41 °F

  • Average September

    53.7 °F

  • Highest 1 September, 2025

    68 °F

Climate (2020–Present)

Grand Marais, The Bay of Grand Marais (28 miles)

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  • Average Low 2020–2025

    33.8 °F

  • Average 2020–2025

    41.2 °F

  • Average High 2020–2025

    48.4 °F
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