Grass Lake Weather Forecast

    • 45
    • 58

    Chance Rain Showers

    • 46
    • 62

    Chance Rain Showers

    • 53
    • 69

    Partly Sunny

    • 56
    • 72

    Slight Chance Rain Showers

    • 53
    • 72

    Partly Sunny

    • 50
    • 64

    Partly Sunny

    • 52
    • 64

    Partly Sunny

Today 6 Sep Alpena

Mostly cloudy with a 50 percent chance of light rain Showers. Highs in the upper 50s. West Winds 5 to 15 Mph.

Tonight 6 Sep Alpena

Partly cloudy. Chance of rain Showers Early, then slight chance of rain Showers after midnight. Lows in the lower 40s. West Winds 5 to 10 Mph. Chance of Showers 40 percent.

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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 4 September, 2025

    42.1 °F

  • Average September

    58.5 °F

  • Highest 2 September, 2025

    73.9 °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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