Summit Lake Weather Forecast

    • 61
    • 78

    Chance Thunderstorms

    • 56
    • 73

    Chance Rain Showers

    • 58
    • 74

    Slight Chance Thunderstorms

    • 63
    • 78

    Chance Rain Showers

    • 59
    • 79

    Mostly Sunny

    • 59
    • 75

    Partly Sunny

Today 17 Aug Grant

Partly sunny. A slight chance of Thunderstorms this Morning, then a chance of Thunderstorms this afternoon. Highs in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

Tonight 17 Aug Grant

Partly cloudy with a chance of Thunderstorms in the Evening, then mostly cloudy with a slight chance of Showers after midnight. Patchy fog after midnight. Lows in the upper 50s. West Winds 5 to 10 Mph. Chance of rain 40 percent.

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Summit Lake Temperature Statistics

August Temperature

Sisseton, Sisseton Municipal Airport (26.1 miles)

  • Lowest 5 August, 2026

    52 °F

  • Average August

    69.8 °F

  • Highest 3 August, 2026

    84.9 °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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