Big Bay Weather Forecast

    • 53
    • 71

    Increasing Clouds

    • 53
    • 64

    Partly Sunny

    • 56
    • 69

    Rain Showers

    • 54
    • 69

    Breezy

    • 54
    • 65

    Mostly Cloudy

    • 54
    • 68

    Slight Chance Rain Showers

Today 12 Sep Keweenaw

Cooler. Partly cloudy with a slight chance of Showers in the Morning, then sunny in the afternoon. Highs around 69. West Winds 10 to 20 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

Tonight 12 Sep Keweenaw

Partly cloudy in the Evening, then becoming mostly cloudy. Lows 51 to 56. West Winds 10 to 15 Mph, becoming northwest after midnight. Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Bay Temperature Statistics

September Temperature

Copper Harbor (6.2 miles)

  • Lowest 5 September, 2026

    54 °F

  • Average September

    66.2 °F

  • Highest 1 September, 2026

    80.1 °F

Climate (2021–2026)

Copper Harbor (6.2 miles)

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  • Average Low 2021–2026

    38.2 °F

  • Average 2021–2026

    44.4 °F

  • Average High 2021–2026

    50.6 °F
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