Knoxville Weather Forecast

    • 63
    • 81

    Chance Thunderstorms

    • 59
    • 78

    Chance Rain Showers

    • 63
    • 79

    Chance Rain Showers

    • 62
    • 80

    Chance Rain Showers

    • 58
    • 80

    Chance Rain Showers

    • 55
    • 75

    Slight Chance Thunderstorms

Today 18 Sep Marion

Mostly cloudy. A slight chance of Showers. A slight chance of Thunderstorms early this Morning, then a chance of Thunderstorms this afternoon. Humid with Highs in the lower 80s. South Winds 5 to 10 Mph. Chance of rain 30 percent.

Tonight 18 Sep Marion

Mostly cloudy with a chance of Showers. A chance of Thunderstorms, mainly in the evening. Humid with Lows in the lower 60s. South Winds around 5 Mph. Chance of rain 50 percent.

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Knoxville Temperature Statistics

September Temperature

Knoxville (1.2 miles)

  • Lowest 7 September, 2025

    42.8 °F

  • Average September

    68 °F

  • Highest 13 September, 2025

    95 °F

Climate (2020–Present)

Knoxville (1.2 miles)

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  • Average Low 2020–2025

    43 °F

  • Average 2020–2025

    52.5 °F

  • Average High 2020–2025

    62.1 °F
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