Island Lake Weather Forecast

    • 61
    • 84

    Rain Showers Likely

    • 53
    • 75

    Mostly Sunny

    • 48
    • 63

    Mostly Sunny

    • 44
    • 60

    Mostly Sunny

    • 47
    • 62

    Mostly Sunny

    • 51
    • 67

    Mostly Sunny

Today 21 Aug Marshall

Mostly sunny. A chance of Showers with a slight chance of Thunderstorms in the afternoon. Humid with Highs in the mid 80s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

Tonight 21 Aug Marshall

Partly cloudy with a 50 percent chance of Thunderstorms. Humid with Lows in the lower 60s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Lake Temperature Statistics

August Temperature

Sisseton, Sisseton Municipal Airport (14.3 miles)

  • Lowest 2 August, 2025

    51.7 °F

  • Average August

    70.8 °F

  • Highest 11 August, 2025

    86.6 °F

Climate (2020–Present)

Sisseton, Sisseton Municipal Airport (14.3 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    46.6 °F

  • Average High 2020–2025

    57 °F
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