Flat Lake Weather Forecast

    • 34
    • 54

    Mostly Sunny

    • 48
    • 69

    Partly Sunny

    • 40
    • 67

    Breezy

    • 48
    • 69

    Breezy

    • 53
    • 79

    Breezy

    • 52
    • 79

    Partly Sunny

Today 10 May Marshall

Widespread frost in the morning. Mostly sunny. Highs in the upper 50s. North Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 10 May Marshall

Mostly clear. Widespread frost. Cold with Lows in the lower 30s. Northwest Winds 5 to 10 Mph.

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Flat Lake Temperature Statistics

May Temperature

Sisseton, Sisseton Municipal Airport (21.7 miles)

  • Lowest 7 May, 2026

    26.1 °F

  • Average May

    48 °F

  • Highest 2 May, 2026

    70 °F

Climate (2021–Present)

Sisseton, Sisseton Municipal Airport (21.7 miles)

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  • Average Low 2021–2026

    35.9 °F

  • Average 2021–2026

    46.6 °F

  • Average High 2021–2026

    57.1 °F
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