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

More about Knoxville

Knoxville by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Tennessee

Holiday Autos discount code: up to 10% off global car hire

  • Save up to 10% on cheap car hire worldwide
  • Exclusive Holiday Autos discount code automatically applied
  • Travel before 31st December 2024 (inclusive)
Show discount codeShow discount code ******vel
Redeem Holiday Autos discount code >>

Expires at 23:59 on Tuesday 31st Dec 2024 · View all Holiday Autos offers

Holiday AutosCar hire finder

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^