Carterville Weather Forecast

    • 35
    • 47

    Increasing Clouds

    • 24
    • 46

    Slight Chance Snow Showers

    • 24
    • 36

    Mostly Sunny

    • 39
    • 48

    Mostly Cloudy

    • 28
    • 50

    Mostly Cloudy

    • 24
    • 41

    Slight Chance Rain Showers

Today 6 Dec Williamson

Sunny. Highs in the upper 40s. South Winds around 5 Mph.

Tonight 6 Dec Williamson

Mostly cloudy. Near steady temperature in the mid 30s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Carterville Temperature Statistics

December Temperature

Marion - Williamson County Regional Airport (3.1 miles)

  • Lowest 4 December, 2025

    23 °F

  • Average December

    28.6 °F

  • Highest 3 December, 2025

    35.6 °F

Climate (2020–Present)

Marion - Williamson County Regional Airport (3.1 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.8 °F

  • Average High 2020–2025

    67.6 °F
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