Summit Lake Weather Forecast

    • 61
    • 79

    Increasing Clouds

    • 61
    • 76

    Rain Showers Likely

    • 64
    • 79

    Chance Thunderstorms

    • 67
    • 83

    Mostly Sunny

    • 70
    • 85

    Mostly Sunny

    • 67
    • 84

    Chance Rain Showers

Today 31 Aug Grant

Mostly sunny. Highs in the lower 80s. Northwest Winds 5 to 10 Mph.

Tonight 31 Aug Grant

Partly cloudy. Lows around 60. Southwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summit Lake Temperature Statistics

August Temperature

Sisseton, Sisseton Municipal Airport (26.1 miles)

  • Lowest 23 August, 2026

    48 °F

  • Average August

    69.2 °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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