Johnston City Weather Forecast

    • 60
    • 93

    Mostly Sunny

    • 64
    • 94

    Mostly Sunny

    • 65
    • 91

    Slight Chance Thunderstorms

    • 66
    • 90

    Chance Thunderstorms

    • 66
    • 89

    Chance Rain Showers

    • 65
    • 88

    Chance Rain Showers

Today 17 Sep Williamson

Sunny. Near steady temperature in the lower 90s. North Winds around 5 Mph.

Tonight 17 Sep Williamson

Clear. Lows in the lower 60s. East Winds around 5 Mph, becoming southeast after midnight.

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  • Temperature Real-Time

Johnston City Temperature Statistics

September Temperature

Marion - Williamson County Regional Airport (5.6 miles)

  • Lowest 8 September, 2025

    41.5 °F

  • Average September

    67.4 °F

  • Highest 14 September, 2025

    96.8 °F

Climate (2020–Present)

Marion - Williamson County Regional Airport (5.6 miles)

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  • Average Low 2020–2025

    47.2 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    67.5 °F
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