Mountainburg Weather Forecast

    • 71
    • 91

    Mostly Cloudy

    • 68
    • 93

    Partly Sunny

    • 68
    • 92

    Slight Chance Thunderstorms

    • 67
    • 89

    Chance Thunderstorms

    • 65
    • 85

    Chance Thunderstorms

    • 63
    • 85

    Slight Chance Rain Showers

Today 14 Sep Crawford

Partly sunny. Isolated Showers in the afternoon. Highs in the lower 90s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

Tonight 14 Sep Crawford

Mostly cloudy. Lows in the lower 70s. East Winds around 5 Mph.

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Mountainburg Temperature Statistics

September Temperature

Fort Smith Regional Airport (23.6 miles)

  • Lowest 7 September, 2025

    55.9 °F

  • Average September

    73.7 °F

  • Highest 11 September, 2025

    93.9 °F

Climate (2020–Present)

Fort Smith Regional Airport (23.6 miles)

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  • Average Low 2020–2025

    53.5 °F

  • Average 2020–2025

    63.8 °F

  • Average High 2020–2025

    75.1 °F
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