Summit Lake Weather Forecast

    • 57
    • 64

    Rain Showers

    • 57
    • 63

    Rain Showers

    • 57
    • 68

    Mostly Cloudy

    • 56
    • 68

    Rain Showers Likely

    • 50
    • 62

    Chance Rain Showers

    • 51
    • 63

    Slight Chance Rain Showers

Today 25 Sep Grant

Patchy fog late this morning. Mostly cloudy. Highs in the mid 60s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 25 Sep Grant

Cloudy. Patchy fog. Showers with a slight chance of drizzle after midnight. Lows in the mid 50s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 90 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

    64.9 °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

    57 °F
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