Knoxville weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: April – May, September – October
What is the weather like in Knoxville in September?
In September, Knoxville is hot: daytime highs average 27 °C, and nights cool down to about 17 °C. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 89 mm. On about 7 days the thermometer climbs to 30 °C or more. All in all, September is an excellent month for a holiday in Knoxville.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 60 | 81 | 82 |
| Day | 30° | 27° | 21° |
| Night | 20° | 17° | 11° |
| Sun | 7 h | 6 h | 6 h |
| Rain days | 12 | 8 | 8 |
More details for September
- Daylight
- 12 h 28 min07:17 – 19:45
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 8 daysdew point 18 °C or moreAll months
- Wind
- 10 km/haverage daily peakAll months
- Cloud cover
- 47 %on averageAll months
- Hot days
- 7 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 50 %99 %
- Sunshineweight 20 %55 %
- Few rainy daysweight 30 %69 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Rain jacket or umbrella
Knoxville in September: quick answers
Is Knoxville hot in September?
Yes. In September, Knoxville is hot: daytime highs average 27 °C and nights stay around 17 °C. On about 7 days the thermometer climbs to 30 °C or more.
Does it rain much in Knoxville in September?
Rain falls on about 8 days, adding up to 89 mm.
Knoxville month by month
The whole year in KnoxvilleAll destinations: USAWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences