Knoxville (TN)
September
Weather in Knoxville, Tennessee for September 2026
Your guide to Knoxville weather in September - trends and predictions
So far, September 2026 in Knoxville shows a warmer trend than usual by 4.7 °F.
Expect cooler weather in the next days in Knoxville with the forecast suggesting a temperature of 27.2 °F, lower than the historical average.
In general, the average temperature in Knoxville at the beginning of September is 30.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.4 °F by the end of September.
Knoxville in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 215.4 mm.
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Temperatures
Rain 🌧️
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13
Dry days
17
Rainy days
0
Snow days
27°/17°
Temperatures
11 km/h
Avg max wind
69 %
Avg humidity
Knoxville Weather September
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Temperatures trend during September in Knoxville
See the weather trend as well as the moving average line
September weather in Knoxville day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 30° /18° | 1.6 mm | 7 | |
| Sept. 2 | Overcast | 31° /18° | 6.1 mm | 7 | |
| Sept. 3 |  Mist | 30° /18° | 0 mm | 7 | |
| Sept. 4 | Mist | 32° /18° | 2.1 mm | 7 | |
| Sept. 5 | Fog | 33° /19° | 4.4 mm | 8 | |
| Sept. 6 |  Light rain shower | 31° /19° | 1.9 mm | 7 | |
| Sept. 7 | Patchy rain possible | 28° /16° | 0.4 mm | 6 | |
| Sept. 8 |  Sunny | 28° /14° | 0 mm | 8 | |
| Sept. 9 | Sunny | 29° /15° | 0.4 mm | 7 | |
| Sept. 10 | Light rain shower | 29° /15° | 1.1 mm | 7 | |
| Sept. 11 | Overcast | 33° /21° | 0 mm | 8.1 | |
| Sept. 12 | Patchy rain possible | 28° /20° | 6.1 mm | 4.6 | |
| Sept. 13 | Fog | 30° /21° | 0.4 mm | 7.9 | |
| Sept. 14 | Overcast | 33° /22° | 0.4 mm | 7.9 | |
| Sept. 15 | Sunny | 34° /24° | 0 mm | 8 | |
| Sept. 16 | Sunny | 34° /23° | 0.4 mm | 8 | |
| Sept. 17 | Patchy rain possible | 32° /21° | 4.1 mm | 7 | |
| Sept. 18 | Overcast | 26° /19° | 0.3 mm | 6 | |
| Sept. 19 | Patchy rain possible | 21° /19° | 8 mm | 4 | |
| Sept. 20 | Mist | 22° /18° | 7.3 mm | 5 | |
| Sept. 21 | Patchy rain possible | 19° /16° | 20.3 mm | 4 | |
| Sept. 22 | Fog | 25° /16° | 3 mm | 5 | |
| Sept. 23 | Overcast | 20° /15° | 2.8 mm | 4 | |
| Sept. 24 | Fog | 24° /14° | 0.3 mm | 5 | |
| Sept. 25 |  Moderate or heavy rain shower | 26° /18° | 57.5 mm | 6 | |
| Sept. 26 |  Partly cloudy | 26° /18° | 36.3 mm | 6 | |
| Sept. 27 | Patchy rain possible | 26° /18° | 34.1 mm | 6 | |
| Sept. 28 |  Thundery outbreaks possible | 25° /16° | 7 mm | 6 | |
| Sept. 29 | Light rain shower | 25° /15° | 1.6 mm | 6 | |
| Sept. 30 | Mist | 26° /16° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Knoxville in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Knoxville forecast closer to your planned date for the most up-to-date weather information.
Change Month
Knoxville in September - FAQ
What are the expected maximum and minimum temperatures in Knoxville during September?
During September, expect a variety of temperatures with highs around 27° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Knoxville during September?
Significant rainfall exceeding 215.4 mm is expected in Knoxville during September, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Knoxville during September?
The average wind speed in Knoxville during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Knoxville
Explore the daily rainfall trends and prepare for Knoxvilles September weather 💧
Typically, Knoxville has 17 rainy days in September with a total of 215.4 mm of rainfall.
UV exposure in Knoxville during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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