Grand Mere State Park Weather Forecast

    • 63
    • 77

    Becoming Sunny

    • 66
    • 83

    Mostly Sunny

    • 62
    • 82

    Slight Chance Thunderstorms

    • 58
    • 75

    Partly Sunny

    • 56
    • 71

    Partly Sunny

    • 56
    • 72

    Partly Sunny

Today 21 Aug Southern Berrien

Partly cloudy. Highs in the upper 70s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon.

Tonight 21 Aug Southern Berrien

Clear. Lows around 60. North Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming east after midnight.

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Grand Mere State Park Temperature Statistics

August Temperature

Southwest Michigan Regional Airport (10.6 miles)

  • Lowest 2 August, 2025

    49.6 °F

  • Average August

    74.4 °F

  • Highest 9 August, 2025

    94.6 °F

Climate (2020–Present)

Southwest Michigan Regional Airport (10.6 miles)

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  • Average Low 2020–2025

    43.5 °F

  • Average 2020–2025

    52.1 °F

  • Average High 2020–2025

    60.7 °F
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