Weather in Knox County, Tennessee for September 2025
Until now, September 2025 in Knox County is cooler than usual, with temperatures averaging 25.7 °F, this is -2.3 °F below the typical seasonal average.
The forecast for the upcoming days in Knox County predicts a temperature of 30.9 °F, which is slightly above the historical average.
In general, the average temperature in Knox County at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 29.6 °F by the end of September.
The climate of Knox County in September is notably wet, with an average of 15 rainy days, and a total of 200 mm of precipitation.
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Knox County Weather September
Temperatures trend during September in Knox County
September weather in Knox County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 28° /17° | 2.1 mm | 6 | |
| Sept. 2 | Overcast | 29° /17° | 8.2 mm | 6 | |
| Sept. 3 |  Mist | 28° /17° | 0 mm | 6 | |
| Sept. 4 | Mist | 30° /17° | 2.8 mm | 7 | |
| Sept. 5 | Fog | 31° /19° | 5.9 mm | 7 | |
| Sept. 6 |  Light rain shower | 29° /18° | 2.4 mm | 7 | |
| Sept. 7 | Fog | 26° /15° | 0.3 mm | 6 | |
| Sept. 8 |  Cloudy | 27° /13° | 0 mm | 7 | |
| Sept. 9 |  Sunny | 27° /13° | 0.5 mm | 7 | |
| Sept. 10 | Light rain shower | 27° /14° | 1.3 mm | 6 | |
| Sept. 11 | Fog | 29° /15° | 0.1 mm | 7 | |
| Sept. 12 | Mist | 27° /16° | 0.3 mm | 6 | |
| Sept. 13 | Mist | 26° /15° | 1.4 mm | 6 | |
| Sept. 14 | Cloudy | 28° /17° | 0.3 mm | 6 | |
| Sept. 15 |  Partly cloudy | 32° /16° | 0 mm | 1.4 | |
| Sept. 16 | Overcast | 27° /16° | 0 mm | 1 | |
| Sept. 17 | Mist | 26° /15° | 0 mm | 1.7 | |
| Sept. 18 | Sunny | 31° /17° | 0 mm | 1.7 | |
| Sept. 19 | Sunny | 32° /16° | 0 mm | 0 | |
| Sept. 20 | Sunny | 34° /17° | 0 mm | 6 | |
| Sept. 21 | Sunny | 31° /19° | 0 mm | 6 | |
| Sept. 22 | Sunny | 30° /16° | 0 mm | 6 | |
| Sept. 23 | Patchy rain possible | 32° /18° | 0.6 mm | 5 | |
| Sept. 24 | Sunny | 34° /18° | 0.1 mm | 6 | |
| Sept. 25 | Sunny | 33° /18° | 0 mm | 6 | |
| Sept. 26 | Sunny | 31° /18° | 0 mm | 6 | |
| Sept. 27 | Sunny | 30° /20° | 0 mm | 6 | |
| Sept. 28 | Sunny | 29° /16° | 0 mm | 6 | |
| Sept. 29 | Light rain shower | 24° /14° | 2.5 mm | 5 | |
| Sept. 30 | Mist | 26° /16° | 0 mm | 6 | |
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Knox County in September - FAQ
September rainfall patterns in Knox County
UV exposure in Knox County during 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.