Steffan Reservoir Weather Forecast

    • 41
    • 67

    Increasing Clouds

    • 47
    • 74

    Partly Sunny

    • 41
    • 70

    Mostly Cloudy

    • 42
    • 69

    Partly Sunny

    • 52
    • 82

    Chance Thunderstorms

    • 47
    • 78

    Mostly Sunny

    • 53
    • 81

    Slight Chance Rain Showers

Today 7 May Knox

Sunny, warmer with Highs in the upper 60s. Northwest Winds 5 to 10 Mph.

Tonight 7 May Knox

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the lower 40s. North Winds 5 to 10 Mph, becoming southeast after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

May Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 2 May, 2026

    30.9 °F

  • Average May

    52.5 °F

  • Highest 3 May, 2026

    72 °F

Climate (2021–Present)

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