Knox County (Knoxville)
September
Weather in Knox County for September 2025
Your guide to Knox County weather in September - trends and predictions
In general, the average temperature in Knox County 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.
Knox County sees moderate rainfall in September, averaging 10 rainy days.
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20
Dry days
10
Rainy days
0
Snow days
29°/16°
Temperatures
10 km/h
Avg max wind
66 %
Avg humidity
Knox County 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 Knox County
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 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.
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 29° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Knox County during September?
In September, Knox County can expect light to moderate rainfall, totaling 31.3 mm across approximately 10 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Knox County during September?
The average wind speed in Knox County during September is 10 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 💧
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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