Knoxville weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Knoxville in September. Check more long-term weather averages for Knoxville in September before you book your next holiday to Tennessee in 2025/2026.

  • 27°C maximum daytime temperature in September in Knoxville27
    27°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Knoxville8
    8 days with some rainfall
  • 15°C minimum night-time temperature in September in Knoxville15
    15°C min night temperature
  • 12 hours of daylight per day in September in Knoxville12
    12 hours of daylight per day
  • Low heat & humidity in September in KnoxvilleL
    Low heat & humidity
  • 81 mm monthly rainfall in September in Knoxville81
    81 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Knoxville8
    8 (Very High) UV index

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The September weather guide for Tennessee (Knoxville) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Knoxville in September?

Daytime temperatures usually reach 27°C in Knoxville in September with low heat and humidity, falling to 15°C at night.

How sunny is it in Knoxville in September?

There are normally 8 hours of bright sunshine each day in Knoxville in September - that's 61% of daylight hours.

Does it rain in Knoxville in September?

There are usually 8 days with some rain in Knoxville in September and the average monthly rainfall is 81mm.

What is the chance of a hurricane in Knoxville in September?

On average less than 1 day in September in Knoxville is likely to be affected by the passage of one or more tropical storms.

Knoxville September sunrise & sunset times

Browse the sunrise and sunset times for Knoxville in September 2025. Select a month to view Knoxville sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:08 19:03
Monday, 15th September 2025 06:18 18:42
Tuesday, 30th September 2025 06:30 18:20

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