Knoxville weather in September
September in Knoxville averages 83°F by day and 61°F at night, with 3.5 inches of precipitation. It is the 4th-warmest and 11th-wettest month of the year here.
- Average high
- 83°F-5° vs August
- Average low
- 61°F0 nights below freezing
- Precipitation
- 3.5 in5 days with 0.1 in. or more
- Snow
- 0.0 in5 days at 90°F+
Is September a good time to visit Knoxville?
Yes. September is one of the most comfortable months in Knoxville by our rule (highs of 62 to 86°F, lows of 42°F or more and under 4.5 inches of precipitation). The most comfortable months overall are May to June and September to October.
On September 15 the sun rises at 7:18 am and sets at 7:42 pm, giving 12h 24m of daylight. Daylight all year.
What to pack for Knoxville in September
- Summer clothes, with a light layer for air conditioning
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| Knoxville | 83°F | 61°F | 3.5 in | |
| Asheville, NC | 84 mi | 79°F | 58°F | 3.7 in |
| Chattanooga, TN | 100 mi | 84°F | 64°F | 4.2 in |
| Greenville, SC | 118 mi | 83°F | 62°F | 3.7 in |
| Johns Creek, GA | 136 mi | 83°F | 63°F | 4.1 in |
| Roswell, GA | 138 mi | 83°F | 63°F | 4.1 in |
| Murfreesboro, TN | 138 mi | 84°F | 59°F | 4.0 in |
Frequently asked questions
What is the weather like in Knoxville in September?
In September, Knoxville averages a high of 83°F and a low of 61°F, with 3.5 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit Knoxville?
Yes. September is one of Knoxville's most comfortable months by our rule: highs between 62°F and 86°F, lows of 42°F or more and modest rain.
Does it snow in Knoxville in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: Knoxville in August and Knoxville in October. All twelve months: Knoxville weather by month.
NOAA NCEI 1991-2020 climate normals, station Knoxville Mcghee Tyson Airport, TN, 12 miles from the city center.