Legion Lake Weather Forecast

    • 46
    • 55

    Rain Showers

    • 46
    • 57

    Rain Showers Likely

    • 51
    • 64

    Mostly Cloudy

    • 53
    • 74

    Chance Rain Showers

    • 54
    • 76

    Mostly Sunny

    • 56
    • 75

    Partly Sunny

Today 20 Sep Central Black Hills

Areas of fog this morning. Showers. A slight chance of Thunderstorms this Morning, then Thunderstorms this afternoon. Highs in the mid 50s. East Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon. Chance of rain 90 percent.

Tonight 20 Sep Central Black Hills

Showers with a slight chance of Thunderstorms in the Evening, then Showers likely after midnight. Lows in the mid 40s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Legion Lake Temperature Statistics

September Temperature

Custer, Custer County Airport (7.5 miles)

  • Lowest 15 September, 2026

    39.7 °F

  • Average September

    62.7 °F

  • Highest 4 September, 2026

    86.6 °F

Climate (2021–2026)

Custer, Custer County Airport (7.5 miles)

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  • Average Low 2021–2026

    33.6 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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