Grass Lake Weather Forecast

    • 43
    • 64

    Becoming Sunny

    • 50
    • 67

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 53
    • 78

    Mostly Sunny

    • 52
    • 79

    Mostly Sunny

    • 57
    • 78

    Partly Sunny

Today 7 Sep Muskegon

Partly sunny through mid afternoon then becoming mostly sunny. Highs in the mid 60s. Northwest Winds 10 to 15 Mph.

Tonight 7 Sep Muskegon

Mostly clear. Lows in the mid 40s. Light Winds.

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Grass Lake Temperature Statistics

September Temperature

Fremont Municipal Airport (9.9 miles)

  • Lowest 4 September, 2025

    41 °F

  • Average September

    59.6 °F

  • Highest 1 September, 2025

    78.8 °F

Climate (2020–Present)

Fremont Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    40.3 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    58.1 °F
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