Rock Island Weather Forecast

    • 77
    • 101

    Hot

    • 76
    • 101

    Slight Chance Thunderstorms

    • 74
    • 100

    Hot

    • 73
    • 100

    Hot

    • 73
    • 100

    Hot

    • 71
    • 97

    Chance Rain Showers

Today 15 Sep Northern Le Flore

Sunny, hot with Highs around 102. South Winds 5 to 10 Mph. Heat index Values up to 108.

Tonight 15 Sep Northern Le Flore

Mostly clear. Lows in the upper 70s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Island Temperature Statistics

September Temperature

Fort Smith Regional Airport (11.8 miles)

  • Lowest 11 September, 2026

    74.6 °F

  • Average September

    89.9 °F

  • Highest 4 September, 2026

    106.6 °F

Climate (2021–2026)

Fort Smith Regional Airport (11.8 miles)

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  • Average Low 2021–2026

    54.4 °F

  • Average 2021–2026

    65.1 °F

  • Average High 2021–2026

    76.6 °F
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