Thunder Bay National Marine Sanctuary Weather Forecast

    • 61
    • 65

    Rain Showers

    • 62
    • 66

    Mostly Sunny

    • 68
    • 72

    Partly Sunny

    • 67
    • 73

    Chance Rain Showers

    • 66
    • 72

    Chance Rain Showers

Today 23 Aug Alpena

Partly sunny with scattered rain Showers. Highs in the mid 60s. Northwest Winds 15 to 20 Mph with Gusts to around 35 Mph. Chance of Showers 40 percent.

Tonight 23 Aug Alpena

Mostly cloudy with chance of rain Showers Early, then partly cloudy after midnight. Lows in the lower 50s. Northwest Winds 10 to 15 Mph with Gusts to around 35 Mph. Chance of Showers 40 percent.

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Thunder Bay National Marine Sanctuary Temperature Statistics

August Temperature

Alpena, Alpena County Regional Airport (22.4 miles)

  • Lowest 20 August, 2026

    48 °F

  • Average August

    68.7 °F

  • Highest 4 August, 2026

    86.6 °F

Climate (2021–2026)

Alpena, Alpena County Regional Airport (22.4 miles)

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  • Average Low 2021–2026

    36.8 °F

  • Average 2021–2026

    46.6 °F

  • Average High 2021–2026

    56.2 °F
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