Summit Lake Weather Forecast

    • 63
    • 79

    Becoming Sunny

    • 62
    • 82

    Chance Thunderstorms

    • 58
    • 72

    Chance Thunderstorms

    • 56
    • 67

    Chance Rain Showers

    • 54
    • 65

    Chance Rain Showers

    • 55
    • 65

    Mostly Cloudy

Today 15 Sep Grant

Partly cloudy. Highs in the lower 80s. South Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 15 Sep Grant

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

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summit Lake Temperature Statistics

September Temperature

Sisseton, Sisseton Municipal Airport (26.1 miles)

  • Lowest 7 September, 2025

    33.1 °F

  • Average September

    59.8 °F

  • Highest 2 September, 2025

    82 °F

Climate (2020–Present)

Sisseton, Sisseton Municipal Airport (26.1 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    46.6 °F

  • Average High 2020–2025

    57.1 °F
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