Bismark Lake Weather Forecast

    • 49
    • 66

    Slight Chance Thunderstorms

    • 53
    • 80

    Partly Sunny

    • 52
    • 64

    Chance Thunderstorms

    • 53
    • 75

    Chance Rain Showers

    • 48
    • 70

    Chance Rain Showers

    • 45
    • 68

    Chance Rain Showers

    • 48
    • 69

    Mostly Sunny

Today 15 Sep Central Black Hills

Partly cloudy. Near steady temperature in the lower 60s. Southeast Winds 5 to 10 Mph with Gusts up to 30 Mph.

Tonight 15 Sep Central Black Hills

Mostly clear in the Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows in the upper 40s. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Bismark Lake Temperature Statistics

September Temperature

Custer, Custer County Airport (5.6 miles)

  • Lowest 13 September, 2026

    42.1 °F

  • Average September

    64.4 °F

  • Highest 4 September, 2026

    86.6 °F

Climate (2021–2026)

Custer, Custer County Airport (5.6 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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