Grass Lake Weather Forecast

    • 55
    • 68

    Increasing Clouds

    • 53
    • 63

    Partly Sunny

    • 56
    • 66

    Mostly Cloudy

    • 59
    • 70

    Chance Rain Showers

    • 58
    • 72

    Chance Rain Showers

    • 57
    • 71

    Chance Rain Showers

Today 18 Sep Alpena

Partly sunny. Isolated rain Showers early. Highs in the lower 70s. North Winds up to 10 Mph. Chance of Showers 20 percent.

Tonight 18 Sep Alpena

Partly cloudy early then becoming mostly cloudy. Lows in the mid 50s. Northeast Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Lake Temperature Statistics

September Temperature

Alpena, Alpena County Regional Airport (11.2 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 (11.2 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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