Johnston City Weather Forecast

    • 32
    • 39

    Mostly Sunny

    • 31
    • 53

    Partly Sunny

    • 28
    • 45

    Partly Sunny

    • 43
    • 50

    Mostly Cloudy

    • 53
    • 60

    Mostly Cloudy

    • 57
    • 65

    Mostly Cloudy

Today 19 Dec Williamson

Sunny, cooler with Highs around 40. West Winds 10 to 15 Mph with Gusts up to 30 Mph, becoming southwest 5 to 10 Mph in the afternoon.

Tonight 19 Dec Williamson

Partly cloudy. Much cooler with Lows in the upper 20s. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph.

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Johnston City Temperature Statistics

December Temperature

Marion - Williamson County Regional Airport (5.6 miles)

  • Lowest 14 December, 2025

    8.6 °F

  • Average December

    33 °F

  • Highest 6 December, 2025

    48.2 °F

Climate (2020–Present)

Marion - Williamson County Regional Airport (5.6 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.7 °F

  • Average High 2020–2025

    67.5 °F
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