Downtown Knoxville Weather Forecast

    • 72
    • 95

    Chance Rain Showers

    • 70
    • 94

    Chance Thunderstorms

    • 70
    • 93

    Slight Chance Thunderstorms

    • 68
    • 92

    Chance Thunderstorms

    • 67
    • 89

    Rain Showers Likely

    • 64
    • 85

    Chance Rain Showers

Today 18 Sep Knox

Mostly sunny. A slight chance of Showers and Thunderstorms late. Highs in the mid 90s. Light Winds. Chance of rain 20 percent.

Tonight 18 Sep Knox

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly cloudy after midnight. Patchy fog late. Lows in the lower 70s. Light Winds. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Downtown Knoxville Temperature Statistics

September Temperature

Knoxville, McGhee Tyson Airport (10.6 miles)

  • Lowest 8 September, 2026

    68.6 °F

  • Average September

    81.9 °F

  • Highest 4 September, 2026

    98.7 °F

Climate (2021–2026)

Knoxville, McGhee Tyson Airport (10.6 miles)

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  • Average Low 2021–2026

    51.4 °F

  • Average 2021–2026

    61.2 °F

  • Average High 2021–2026

    71.8 °F
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