Roslyn Weather Forecast

    • 66
    • 78

    Thunderstorms

    • 61
    • 76

    Mostly Cloudy

    • 60
    • 78

    Mostly Sunny

    • 63
    • 81

    Mostly Sunny

    • 63
    • 83

    Chance Rain Showers

    • 55
    • 75

    Partly Sunny

Today 17 Aug Day

Mostly cloudy in the Morning, then becoming partly sunny. A 50 percent chance of Thunderstorms. Humid with Highs in the upper 70s. East Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 17 Aug Day

Mostly cloudy with a 50 percent chance of Thunderstorms. Near steady temperature around 70. East Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Roslyn Temperature Statistics

August Temperature

Sisseton, Sisseton Municipal Airport (26.7 miles)

  • Lowest 2 August, 2025

    51.7 °F

  • Average August

    70.1 °F

  • Highest 11 August, 2025

    86.6 °F

Climate (2020–Present)

Sisseton, Sisseton Municipal Airport (26.7 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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