Summit Lake Weather Forecast

    • 61
    • 73

    Rain Showers

    • 57
    • 68

    Rain Showers Likely

    • 52
    • 72

    Partly Sunny

    • 46
    • 60

    Mostly Sunny

    • 50
    • 61

    Partly Sunny

    • 49
    • 61

    Partly Sunny

Today 28 Sep Grant

Mostly cloudy. Near steady temperature in the mid 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 28 Sep Grant

Cloudy. A chance of Thunderstorms after midnight. Lows in the lower 60s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summit Lake Temperature Statistics

September Temperature

Sisseton, Sisseton Municipal Airport (26.1 miles)

  • Lowest 13 September, 2026

    43 °F

  • Average September

    64.6 °F

  • Highest 3 September, 2026

    91.9 °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

    56.9 °F
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