Steffan Reservoir Weather Forecast

    • 72
    • 93

    Increasing Clouds

    • 72
    • 95

    Partly Sunny

    • 68
    • 90

    Chance Thunderstorms

    • 67
    • 89

    Chance Thunderstorms

    • 70
    • 91

    Slight Chance Thunderstorms

    • 69
    • 91

    Slight Chance Thunderstorms

Today 29 Aug Knox

Mostly sunny. Humid with Highs in the mid 90s. Southwest Winds 15 to 20 Mph. Gusts up to 35 Mph in the morning. Heat index Values up to 101 in the afternoon.

Tonight 29 Aug Knox

Mostly cloudy with a slight chance of Showers and Thunderstorms. Breezy, warmer. Near steady temperature in the mid 70s. South Winds 20 to 25 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

August Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 5 August, 2026

    52 °F

  • Average August

    72.7 °F

  • Highest 11 August, 2026

    90 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (11.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    39.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.8 °F
Get WillyWeather+ to remove ads