Knox County (Knoxville)
September
Weather in Knox County, Tennessee for September 2026
Your guide to Knox County weather in September - trends and predictions
So far, September 2026 in Knox County shows a warmer trend than usual by 3 °F.
Expect cooler weather in the next days in Knox County with the forecast suggesting a temperature of 24.4 °F, lower than the historical average.
In general, the average temperature in Knox County 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.
Knox County 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
Knox County Weather September
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Temperatures trend during September in Knox County
See the weather trend as well as the moving average line
September weather in Knox County 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 | Fog | 31° /16° | 0.4 mm | 8 | |
| Sept. 12 | Mist | 27° /17° | 22.6 mm | 5 | |
| Sept. 13 | Mist | 27° /16° | 1.2 mm | 6 | |
| Sept. 14 | Patchy rain possible | 29° /18° | 0.5 mm | 7 | |
| Sept. 15 |  Cloudy | 30° /16° | 0 mm | 7 | |
| Sept. 16 | Light rain shower | 28° /17° | 0.8 mm | 7 | |
| Sept. 17 | Light rain shower | 28° /17° | 2.4 mm | 7 | |
| Sept. 18 | Mist | 27° /17° | 1.6 mm | 6 | |
| Sept. 19 | Mist | 29° /17° | 1.9 mm | 7 | |
| Sept. 20 |  Partly cloudy | 30° /17° | 0.5 mm | 7 | |
| Sept. 21 | Overcast | 30° /18° | 1.6 mm | 5 | |
| Sept. 22 |  Moderate or heavy rain shower | 30° /19° | 15.8 mm | 6 | |
| Sept. 23 | Cloudy | 28° /18° | 28.5 mm | 5 | |
| Sept. 24 | Cloudy | 28° /17° | 3.2 mm | 6 | |
| Sept. 25 | Sunny | 24° /13° | 0 mm | 6.9 | |
| Sept. 26 | Sunny | 24° /12° | 0 mm | 6.7 | |
| Sept. 27 | Sunny | 24° /12° | 0 mm | 6.7 | |
| Sept. 28 | Sunny | 24° /13° | 0 mm | 6.8 | |
| Sept. 29 | Sunny | 26° /14° | 0 mm | 6.8 | |
| Sept. 30 | Sunny | 28° /16° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Knox County 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 Knox County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Knox County in September - FAQ
What are the expected maximum and minimum temperatures in Knox County 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 Knox County during September?
Significant rainfall exceeding 215.4 mm is expected in Knox County during September, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Knox County during September?
The average wind speed in Knox County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Knox County
Explore the daily rainfall trends and prepare for Knox Countys September weather 💧
Typically, Knox County has 17 rainy days in September with a total of 215.4 mm of rainfall.
UV exposure in Knox County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Knox County?Get accurate weather forecasts for Knox County, located at latitude 35.961 and longitude -83.921. Stay updated with localized weather information tailored for Knox County.
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