Summit Lake Weather Forecast

    • 65
    • 81

    Thunderstorms Likely

    • 65
    • 81

    Chance Rain Showers

    • 66
    • 83

    Slight Chance Thunderstorms

    • 62
    • 80

    Partly Sunny

    • 63
    • 79

    Slight Chance Thunderstorms

    • 66
    • 81

    Slight Chance Thunderstorms

Today 28 Aug Grant

Partly sunny. Highs in the lower 80s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 28 Aug Grant

Partly cloudy with a slight chance of Thunderstorms in the Evening, then mostly cloudy with Thunderstorms likely after midnight. Not as cool. Humid with Lows in the mid 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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Summit Lake Temperature Statistics

August Temperature

Sisseton, Sisseton Municipal Airport (26.1 miles)

  • Lowest 23 August, 2026

    48 °F

  • Average August

    69.5 °F

  • Highest 20 August, 2026

    86 °F

Climate (2021–2026)

Sisseton, Sisseton Municipal Airport (26.1 miles)

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  • Average Low 2021–2026

    35.9 °F

  • Average 2021–2026

    46.4 °F

  • Average High 2021–2026

    57 °F
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