Thunder Bay National Marine Sanctuary Weather Forecast

    • 61
    • 67

    Increasing Clouds

    • 56
    • 66

    Mostly Cloudy

    • 57
    • 61

    Mostly Sunny

    • 60
    • 63

    Partly Sunny

    • 62
    • 66

    Chance Rain Showers

    • 62
    • 68

    Chance Rain Showers

Today 17 Sep Alpena

Mostly sunny. Highs around 80. Light Winds becoming southeast up to 10 Mph in the afternoon.

Tonight 17 Sep Alpena

Partly cloudy. Lows in the upper 50s. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Thunder Bay National Marine Sanctuary Temperature Statistics

September Temperature

Alpena, Alpena County Regional Airport (22.4 miles)

  • Lowest 8 September, 2025

    39 °F

  • Average September

    58.5 °F

  • Highest 13 September, 2025

    75.9 °F

Climate (2020–Present)

Alpena, Alpena County Regional Airport (22.4 miles)

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  • Average Low 2020–2025

    37.2 °F

  • Average 2020–2025

    46.9 °F

  • Average High 2020–2025

    56.5 °F
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