Flat Lake Weather Forecast

    • 56
    • 72

    Mostly Cloudy

    • 63
    • 74

    Mostly Cloudy

    • 67
    • 81

    Rain Showers

    • 67
    • 88

    Chance Thunderstorms

    • 63
    • 88

    Chance Rain Showers

    • 64
    • 84

    Chance Rain Showers

Today 25 Jun Marshall

Partly sunny. Highs in the mid 70s. North Winds around 5 Mph.

Tonight 25 Jun Marshall

Mostly cloudy. Lows in the upper 50s. East Winds 5 to 10 Mph.

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  • Temperature Real-Time

Flat Lake Temperature Statistics

June Temperature

Sisseton, Sisseton Municipal Airport (21.7 miles)

  • Lowest 14 June, 2026

    46 °F

  • Average June

    68 °F

  • Highest 9 June, 2026

    93 °F

Climate (2021–2026)

Sisseton, Sisseton Municipal Airport (21.7 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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