Lake Dardanelle Weather Forecast

    • 77
    • 96

    Increasing Clouds

    • 74
    • 95

    Chance Thunderstorms

    • 72
    • 94

    Mostly Sunny

    • 68
    • 93

    Sunny

    • 70
    • 91

    Mostly Sunny

    • 74
    • 95

    Mostly Sunny

    • 76
    • 96

    Mostly Sunny

Today 25 Aug Southern Johnson County

Sunny. Much warmer with Highs in the upper 90s. Southeast Winds around 5 Mph. Heat index Values up to 110.

Tonight 25 Aug Southern Johnson County

Mostly cloudy. Lows in the lower 70s. East Winds around 5 Mph. Heat index Values up to 107 early this evening.

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Lake Dardanelle Temperature Statistics

August Temperature

Russelville Municipal Airport (15.5 miles)

  • Lowest 3 August, 2026

    66.7 °F

  • Average August

    85.5 °F

  • Highest 19 August, 2026

    105.7 °F

Climate (2021–2026)

Russelville Municipal Airport (15.5 miles)

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  • Average Low 2021–2026

    52.5 °F

  • Average 2021–2026

    63.9 °F

  • Average High 2021–2026

    75.6 °F
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