Steffan Reservoir Weather Forecast

    • 70
    • 82

    Mostly Sunny

    • 75
    • 101

    Hot

    • 75
    • 103

    Hot

    • 72
    • 99

    Hot

    • 70
    • 96

    Slight Chance Thunderstorms

    • 71
    • 95

    Chance Thunderstorms

    • 69
    • 94

    Chance Thunderstorms

Today 24 Jul Knox

Sunny. Near steady temperature in the mid 80s. South Winds 5 to 10 Mph.

Tonight 24 Jul Knox

Clear. Lows around 70. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

July Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 22 July, 2026

    59 °F

  • Average July

    78.4 °F

  • Highest 17 July, 2026

    97 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (11.2 miles)

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  • Average Low 2021–2026

    39.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.8 °F
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