Grass Lake Weather Forecast

    • 63
    • 84

    Partly Sunny

    • 52
    • 80

    Partly Sunny

    • 60
    • 74

    Partly Sunny

    • 64
    • 84

    Rain Showers Likely

    • 62
    • 78

    Rain Showers Likely

    • 56
    • 77

    Chance Rain Showers

Today 12 Sep St. Joseph

Partly cloudy. Highs in the mid 80s. South Winds around 5 Mph, becoming southwest with Gusts up to 20 Mph in the afternoon.

Tonight 12 Sep St. Joseph

Mostly clear. Lows in the lower 60s. West Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Lake Temperature Statistics

September Temperature

Sturgis, Kirsch Municipal Airport (6.2 miles)

  • Lowest 7 September, 2026

    57.2 °F

  • Average September

    73.7 °F

  • Highest 2 September, 2026

    93.2 °F

Climate (2021–2026)

Sturgis, Kirsch Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.7 °F
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