Summit Lake Weather Forecast

    • 60
    • 69

    Rain Showers

    • 59
    • 69

    Rain Showers Likely

    • 57
    • 66

    Rain Showers Likely

    • 57
    • 72

    Slight Chance Thunderstorms

    • 58
    • 74

    Partly Sunny

    • 53
    • 74

    Mostly Sunny

Today 17 Sep Grant

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms late this Morning, then Showers likely with a chance of Thunderstorms this afternoon. Not as warm with Highs in the lower 70s. North Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

Tonight 17 Sep Grant

Showers likely with a chance of Thunderstorms. Patchy fog after midnight. Lows in the lower 60s. Northeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

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  • 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

    61.8 °F

  • Highest 14 September, 2025

    86 °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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