Knoxville
September
Weather in Knoxville for September 2025
Your guide to Knoxville weather in September - trends and predictions
In general, the average temperature in Knoxville at the beginning of September is 30.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.1 °F by the end of September.
The climate of Knoxville in September is notably wet, with an average of 15 rainy days, and a total of 200 mm of precipitation.
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Temperatures
Rain 🌧️
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15
Dry days
15
Rainy days
0
Snow days
28°/17°
Temperatures
11 km/h
Avg max wind
67 %
Avg humidity
Knoxville in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2 32° | 3  30° | 4 32° | 5 31° | 6  30° | 7 27° |
| 8  28° | 9  29° | 10 30° | 11 31° | 12 26° | 13 24° | 14 27° |
| 15 29° | 16 28° | 17 25° | 18 24° | 19  26° | 20 30° | 21 30° |
| 22 30° | 23 29° | 24 30° | 25 26° | 26 26° | 27 27° | 28 24° |
| 29 24° | 30 26° |
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Temperatures trend during September in Knoxville
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Overcast | 29° /18° | 3.2 mm | 7 | |
| Sept. 2 | Overcast | 32° /18° | 0 mm | 7 | |
| Sept. 3 | Mist | 30° /17° | 0 mm | 7 | |
| Sept. 4 | Mist | 32° /18° | 0 mm | 7 | |
| Sept. 5 | Fog | 31° /18° | 0 mm | 7 | |
| Sept. 6 | Light rain shower | 30° /19° | 1.8 mm | 7 | |
| Sept. 7 | Fog | 27° /16° | 0.4 mm | 6 | |
| Sept. 8 | Cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 9 | Thundery outbreaks possible | 29° /14° | 0.8 mm | 7 | |
| Sept. 10 | Light rain shower | 30° /15° | 2 mm | 7 | |
| Sept. 11 | Fog | 31° /16° | 0.2 mm | 8 | |
| Sept. 12 | Mist | 26° /16° | 0.4 mm | 6 | |
| Sept. 13 | Mist | 24° /16° | 2.2 mm | 6 | |
| Sept. 14 | Cloudy | 27° /17° | 0.5 mm | 6 | |
| Sept. 15 | Cloudy | 29° /15° | 0 mm | 7 | |
| Sept. 16 | Light rain shower | 28° /16° | 1.2 mm | 7 | |
| Sept. 17 | Light rain shower | 25° /16° | 3.7 mm | 6 | |
| Sept. 18 | Overcast | 24° /15° | 0 mm | 6 | |
| Sept. 19 | Partly cloudy | 26° /16° | 0 mm | 7 | |
| Sept. 20 | Partly cloudy | 30° /16° | 0 mm | 8 | |
| Sept. 21 | Overcast | 30° /17° | 2.3 mm | 7 | |
| Sept. 22 | Partly cloudy | 30° /19° | 24.3 mm | 7 | |
| Sept. 23 | Cloudy | 29° /17° | 43 mm | 7 | |
| Sept. 24 | Cloudy | 30° /17° | 1.9 mm | 7 | |
| Sept. 25 | Mist | 26° /17° | 5.5 mm | 6 | |
| Sept. 26 | Partly cloudy | 26° /17° | 46.4 mm | 7 | |
| Sept. 27 | Patchy rain possible | 27° /17° | 47.5 mm | 6 | |
| Sept. 28 | Thundery outbreaks possible | 24° /16° | 10.5 mm | 5 | |
| Sept. 29 | Light rain shower | 24° /14° | 2.5 mm | 5 | |
| Sept. 30 | Mist | 26° /16° | 0 mm | 6 | |
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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.
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 28° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Knoxville during September?
Significant rainfall exceeding 200 mm is expected in Knoxville during September, occurring over more than 15 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 💧
UV exposure in Knoxville during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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