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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.
- 2727°C max day temperature
- 8 hours of sunshine per day
- 88 days with some rainfall
- 1515°C min night temperature
- 1212 hours of daylight per day
- LLow heat & humidity
- 8181 mm of monthly rainfall
- 88 (Very High) UV index
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Recommended for Tennessee
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)
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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