Stone Mountain Weather Forecast

    • 68
    • 87

    Slight Chance Thunderstorms

    • 70
    • 92

    Mostly Sunny

    • 67
    • 91

    Slight Chance Thunderstorms

    • 63
    • 84

    Partly Sunny

    • 60
    • 79

    Partly Sunny

    • 61
    • 80

    Partly Sunny

Today 4 Sep DeKalb

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the mid 80s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 4 Sep DeKalb

Mostly clear. Lows in the upper 60s. Light south Winds.

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Stone Mountain Temperature Statistics

September Temperature

Atlanta, De Kalb-Peachtree Airport (8.7 miles)

  • Lowest 2 September, 2025

    60.1 °F

  • Average September

    70.8 °F

  • Highest 2 September, 2025

    82 °F

Climate (2020–Present)

Atlanta, De Kalb-Peachtree Airport (8.7 miles)

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  • Average Low 2020–2025

    52.9 °F

  • Average 2020–2025

    62.7 °F

  • Average High 2020–2025

    73.1 °F
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