Grass Lake Weather Forecast

    • 68
    • 86

    Chance Rain Showers

    • 65
    • 88

    Slight Chance Thunderstorms

    • 63
    • 82

    Chance Thunderstorms

    • 61
    • 76

    Chance Thunderstorms

    • 58
    • 71

    Chance Rain Showers

    • 57
    • 71

    Mostly Cloudy

Today 15 Sep Hennepin

Partly sunny. Chance of Showers and slight chance of Thunderstorms in the Morning, then slight chance of Thunderstorms in the afternoon. Highs in the mid 80s. South Winds 5 to 15 Mph. Chance of precipitation 30 percent.

Tonight 15 Sep Hennepin

Mostly cloudy. A 20 percent chance of Thunderstorms early in the morning. Near steady temperature in the mid 70s. Southeast Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Lake Temperature Statistics

September Temperature

Minneapolis - Flying Cloud Airport (1.2 miles)

  • Lowest 4 September, 2025

    43 °F

  • Average September

    61.2 °F

  • Highest 12 September, 2025

    81 °F

Climate (2020–Present)

Minneapolis - Flying Cloud Airport (1.2 miles)

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  • Average Low 2020–2025

    39.7 °F

  • Average 2020–2025

    48.6 °F

  • Average High 2020–2025

    57.5 °F
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