Grass Lake Weather Forecast

    • 38
    • 59

    Chance Rain Showers

    • 34
    • 61

    Slight Chance Rain Showers

    • 42
    • 70

    Partly Sunny

    • 49
    • 75

    Mostly Cloudy

    • 46
    • 76

    Partly Sunny

    • 42
    • 70

    Mostly Sunny

Today 6 Sep Roscommon

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

Tonight 6 Sep Roscommon

Partly cloudy with a 20 percent chance of rain Showers. Lows in the upper 30s. Light Winds.

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Grass Lake Temperature Statistics

September Temperature

Houghton Lake, Roscommon County Airport (12.4 miles)

  • Lowest 4 September, 2025

    42.1 °F

  • Average September

    58.3 °F

  • Highest 2 September, 2025

    78.1 °F

Climate (2020–Present)

Houghton Lake, Roscommon County Airport (12.4 miles)

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  • Average Low 2020–2025

    36.3 °F

  • Average 2020–2025

    46.1 °F

  • Average High 2020–2025

    55.6 °F
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