Agate Harbor Weather Forecast

    • 62
    • 74

    Mostly Sunny

    • 62
    • 75

    Mostly Sunny

    • 56
    • 69

    Slight Chance Rain Showers

    • 53
    • 61

    Mostly Cloudy

    • 52
    • 59

    Partly Sunny

    • 53
    • 61

    Mostly Cloudy

Today 15 Sep Keweenaw

Patchy fog this morning. Sunny. Highs in the mid 70s. South Winds 5 to 10 Mph, becoming southeast this afternoon.

Tonight 15 Sep Keweenaw

Clear in the Evening, then becoming partly cloudy. Lows around 59. South Winds 5 to 10 Mph, becoming southwest after midnight.

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Agate Harbor Temperature Statistics

September Temperature

Copper Harbor (8.7 miles)

  • Lowest 4 September, 2025

    46.9 °F

  • Average September

    58.2 °F

  • Highest 1 September, 2025

    75.9 °F

Climate (2020–Present)

Copper Harbor (8.7 miles)

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  • Average Low 2020–2025

    38.5 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    50.9 °F
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