Lake Dardanelle Weather Forecast

    • 76
    • 99

    Chance Thunderstorms

    • 75
    • 96

    Chance Rain Showers

    • 75
    • 94

    Chance Thunderstorms

    • 76
    • 92

    Partly Sunny

    • 77
    • 98

    Hot

    • 75
    • 96

    Slight Chance Thunderstorms

    • 75
    • 94

    Partly Sunny

Today 21 Aug Southern Johnson County

Sunny, hot with Highs around 101. East Winds around 5 Mph. Heat index Values up to 110 this afternoon.

Tonight 21 Aug Southern Johnson County

Mostly clear in the Evening, then partly cloudy with a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the lower 70s. Northeast Winds around 5 Mph. Chance of rain 30 percent. Average rainfall less than 1/10 inch. Heat index Values up to 108 early in the 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

    85.3 °F

  • Highest 19 August, 2026

    105.1 °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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