Thunder Bay National Marine Sanctuary Weather Forecast

    • 57
    • 61

    Rain Showers Likely

    • 55
    • 64

    Rain Showers Likely

    • 53
    • 60

    Chance Rain Showers

    • 53
    • 59

    Slight Chance Rain Showers

    • 57
    • 63

    Partly Sunny

    • 60
    • 67

    Mostly Cloudy

Today 4 Sep Alpena

Partly sunny. A 20 percent chance of rain Showers in the afternoon. Highs in the lower 60s. West Winds 10 to 15 Mph.

Tonight 4 Sep Alpena

Partly cloudy Early, then mostly cloudy with a 50 percent chance of rain Showers after midnight. Lows in the upper 40s. South Winds 5 to 15 Mph. Gusts up to 25 Mph increasing to 40 Mph after midnight.

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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 2 September, 2025

    46.9 °F

  • Average September

    60.9 °F

  • Highest 2 September, 2025

    73.9 °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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