Half Moon Lake Weather Forecast

    • 40
    • 66

    Becoming Sunny

    • 45
    • 71

    Mostly Sunny

    • 52
    • 77

    Partly Sunny

    • 52
    • 80

    Partly Sunny

    • 45
    • 75

    Mostly Sunny

    • 47
    • 74

    Partly Sunny

Today 7 Sep Gratiot

Mostly sunny until midday then becoming partly sunny. Highs in the mid 60s. West Winds 5 to 15 Mph.

Tonight 7 Sep Gratiot

Mostly clear. Lows around 40. Northwest Winds around 10 Mph in the evening becoming light.

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  • Temperature Real-Time

Half Moon Lake Temperature Statistics

September Temperature

Alma, Gratiot Community Airport (11.2 miles)

  • Lowest 4 September, 2025

    42.8 °F

  • Average September

    59.3 °F

  • Highest 2 September, 2025

    78.8 °F

Climate (2020–Present)

Alma, Gratiot Community Airport (11.2 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    58.7 °F
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