Stone Mountain Lake Weather Forecast

    • 73
    • 95

    Mostly Sunny

    • 70
    • 92

    Mostly Sunny

    • 66
    • 92

    Sunny

    • 67
    • 91

    Mostly Sunny

    • 69
    • 93

    Mostly Sunny

    • 70
    • 93

    Mostly Sunny

Today 14 Sep DeKalb

Sunny. Highs in the mid 90s. Light northeast Winds.

Tonight 14 Sep DeKalb

Mostly clear. Lows in the lower 70s. Northeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

Stone Mountain Lake Temperature Statistics

September Temperature

Atlanta, De Kalb-Peachtree Airport (10.6 miles)

  • Lowest 9 September, 2026

    66.7 °F

  • Average September

    82.3 °F

  • Highest 5 September, 2026

    100.7 °F

Climate (2021–2026)

Atlanta, De Kalb-Peachtree Airport (10.6 miles)

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  • Average Low 2021–2026

    53.3 °F

  • Average 2021–2026

    63.5 °F

  • Average High 2021–2026

    74.1 °F
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