Carterville Weather Forecast

    • 69
    • 86

    Sunny

    • 73
    • 97

    Hot

    • 73
    • 96

    Mostly Sunny

    • 72
    • 97

    Hot

    • 72
    • 95

    Mostly Sunny

    • 71
    • 94

    Mostly Sunny

    • 67
    • 90

    Chance Rain Showers

Today 14 Sep Williamson

Sunny. Near steady temperature in the mid 80s. East Winds 5 to 10 Mph.

Tonight 14 Sep Williamson

Clear. Lows in the upper 60s. Southeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Carterville Temperature Statistics

September Temperature

Marion - Williamson County Regional Airport (3.1 miles)

  • Lowest 8 September, 2026

    59 °F

  • Average September

    79.8 °F

  • Highest 5 September, 2026

    100.4 °F

Climate (2021–2026)

Marion - Williamson County Regional Airport (3.1 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    56.3 °F

  • Average High 2021–2026

    68.2 °F
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