Keystone Weather Forecast

    • 59
    • 85

    Chance Thunderstorms

    • 56
    • 76

    Rain Showers

    • 52
    • 66

    Rain Showers

    • 56
    • 75

    Mostly Sunny

    • 63
    • 85

    Mostly Sunny

    • 62
    • 86

    Mostly Sunny

    • 59
    • 86

    Slight Chance Thunderstorms

Today 15 Jun Central Black Hills

Mostly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the lower 80s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 15 Jun Central Black Hills

Mostly cloudy with a chance of Showers and Thunderstorms this Evening, then partly cloudy with a slight chance of Showers after midnight. Lows in the mid 50s. South Winds 5 to 10 Mph. Chance of rain 40 percent.

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Keystone Temperature Statistics

June Temperature

Custer, Custer County Airport (14.9 miles)

  • Lowest 4 June, 2025

    34.6 °F

  • Average June

    56.4 °F

  • Highest 1 June, 2025

    86.6 °F

Climate (2020–Present)

Custer, Custer County Airport (14.9 miles)

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  • Average Low 2020–2025

    33.1 °F

  • Average 2020–2025

    44.8 °F

  • Average High 2020–2025

    56.1 °F
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