Lake Gratiot Weather Forecast

    • 59
    • 66

    Rain Showers

    • 58
    • 72

    Mostly Cloudy

    • 60
    • 77

    Mostly Sunny

    • 64
    • 81

    Partly Sunny

    • 60
    • 81

    Partly Sunny

    • 56
    • 74

    Partly Sunny

Today 18 Aug Keweenaw

Showers in the Morning, then Showers likely with a chance of Thunderstorms in the afternoon. Highs 64 to 69. Southeast Winds 10 to 20 Mph. Chance of rain 90 percent.

Tonight 18 Aug Keweenaw

Showers likely with a slight chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Cloudy. Lows 59 to 64. Southeast Winds 5 to 15 Mph, becoming north 5 to 10 Mph after midnight. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Gratiot Temperature Statistics

August Temperature

Copper Harbor (13.7 miles)

  • Lowest 14 August, 2025

    55.9 °F

  • Average August

    72 °F

  • Highest 8 August, 2025

    86.6 °F

Climate (2020–Present)

Copper Harbor (13.7 miles)

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  • Average Low 2020–2025

    38.5 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    50.8 °F
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