Summit Lake Weather Forecast

    • 52
    • 64

    Rain Showers Likely

    • 50
    • 68

    Mostly Sunny

    • 55
    • 66

    Chance Rain Showers

    • 59
    • 71

    Rain Showers Likely

    • 59
    • 71

    Chance Thunderstorms

    • 56
    • 70

    Mostly Cloudy

Today 14 Sep Grant

A chance of Thunderstorms. Showers. Highs in the lower 70s. South Winds 15 to 20 Mph with Gusts up to 40 Mph. Chance of rain near 100 percent.

Tonight 14 Sep Grant

Partly cloudy in the Evening, then clearing. Lows around 50. West Winds 15 to 20 Mph. Gusts up to 30 Mph, increasing to 40 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summit Lake Temperature Statistics

September Temperature

Sisseton, Sisseton Municipal Airport (26.1 miles)

  • Lowest 12 September, 2026

    48 °F

  • Average September

    70.8 °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

    46.5 °F

  • Average High 2021–2026

    57 °F
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