Keystone Weather Forecast

    • 63
    • 89

    Slight Chance Thunderstorms

    • 54
    • 89

    Chance Thunderstorms

    • 59
    • 75

    Partly Sunny

    • 58
    • 89

    Partly Sunny

    • 50
    • 71

    Chance Thunderstorms

    • 47
    • 66

    Slight Chance Thunderstorms

    • 48
    • 70

    Slight Chance Thunderstorms

Today 6 Jun Central Black Hills

Mostly sunny. Highs in the 80s. South Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 6 Jun Central Black Hills

Mostly cloudy this Evening, then becoming partly cloudy. Isolated Showers and Thunderstorms this evening. Lows around 60. South Winds 10 to 15 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Keystone Temperature Statistics

June Temperature

Custer, Custer County Airport (14.9 miles)

  • Lowest 1 June, 2026

    41.6 °F

  • Average June

    58.2 °F

  • Highest 3 June, 2026

    72.6 °F

Climate (2021–Present)

Custer, Custer County Airport (14.9 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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