Keystone Weather Forecast

    • 55
    • 66

    Rain Showers Likely

    • 54
    • 81

    Slight Chance Thunderstorms

    • 50
    • 71

    Chance Thunderstorms

    • 48
    • 66

    Chance Thunderstorms

    • 48
    • 67

    Slight Chance Thunderstorms

    • 50
    • 69

    Partly Sunny

Today 14 Sep Central Black Hills

Cloudy with a chance of Showers and Thunderstorms. Near steady temperature in the mid 60s. North Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 14 Sep Central Black Hills

Mostly cloudy in the Evening, then clearing. Lows around 50. Southwest Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Keystone Temperature Statistics

September Temperature

Custer, Custer County Airport (14.9 miles)

  • Lowest 6 September, 2025

    32 °F

  • Average September

    60.6 °F

  • Highest 11 September, 2025

    82.9 °F

Climate (2020–Present)

Custer, Custer County Airport (14.9 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    33.1 °F

  • Average 2020–2025

    44.8 °F

  • Average High 2020–2025

    56.2 °F
Get WillyWeather+ to remove ads