Legion Lake Weather Forecast

    • 58
    • 76

    Mostly Cloudy

    • 56
    • 75

    Slight Chance Thunderstorms

    • 55
    • 71

    Chance Thunderstorms

    • 53
    • 70

    Rain Showers

    • 51
    • 67

    Rain Showers Likely

    • 52
    • 72

    Chance Rain Showers

    • 55
    • 77

    Mostly Sunny

Today 26 Aug Central Black Hills

Partly cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 26 Aug Central Black Hills

Partly cloudy. Lows in the mid 50s. Southeast Winds 5 to 10 Mph, becoming west after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Legion Lake Temperature Statistics

August Temperature

Custer, Custer County Airport (7.5 miles)

  • Lowest 9 August, 2025

    44.7 °F

  • Average August

    66.5 °F

  • Highest 7 August, 2025

    92.6 °F

Climate (2020–Present)

Custer, Custer County Airport (7.5 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    56.1 °F
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