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Weather in Knoxville, Tennessee for September 2025

Your guide to Knoxville weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Knoxville is cooler than usual, with temperatures averaging 25.4 °F, this is -2.8 °F below the typical seasonal average.

  • The forecast for the upcoming days in Knoxville predicts a temperature of 29.6 °F, which is slightly above the historical average.

  • In general, the average temperature in Knoxville at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 27 °F by the end of September.

    • Rain 🌧️

  • The climate of Knoxville in September is notably wet, with an average of 15 rainy days, and a total of 200 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
15
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/17°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Knoxville Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
28°
2
Overcast
29°
3
Mist
28°
4
Mist
30°
5
Fog
31°
6
Light rain shower
29°
7
Fog
26°
8
Cloudy
27°
9
Sunny
27°
10
Light rain shower
27°
11
Fog
29°
12
Mist
27°
13
Mist
26°
14
Partly cloudy
32°
15
Patchy rain possible
31°
16
Moderate rain
25°
17
Patchy rain possible
31°
18
Sunny
32°
19
Sunny
32°
20
Sunny
32°
21
Patchy rain possible
29°
22
Sunny
30°
23
Patchy rain possible
26°
24
Patchy rain possible
27°
25
Mist
28°
26
Sunny
29°
27
Sunny
31°
28
Thundery outbreaks possible
24°
29
Light rain shower
24°
30
Mist
26°

Temperatures trend during September in Knoxville

See the weather trend as well as the moving average line

September weather in Knoxville day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Overcast
Overcast
 28° /17° 2.1 mm 6
Sept. 2 Overcast
Overcast
 29° /17° 8.2 mm 6
Sept. 3 Mist
Mist
 28° /17° 0 mm 6
Sept. 4 Mist
Mist
 30° /17° 2.8 mm 7
Sept. 5 Fog
Fog
 31° /19° 5.9 mm 7
Sept. 6 Light rain shower
Light rain shower
 29° /18° 2.4 mm 7
Sept. 7 Fog
Fog
 26° /15° 0.3 mm 6
Sept. 8 Cloudy
Cloudy
 27° /13° 0 mm 7
Sept. 9 Sunny
Sunny
 27° /13° 0.5 mm 7
Sept. 10 Light rain shower
Light rain shower
 27° /14° 1.3 mm 6
Sept. 11 Fog
Fog
 29° /15° 0.1 mm 7
Sept. 12 Mist
Mist
 27° /16° 0.3 mm 6
Sept. 13 Mist
Mist
 26° /15° 1.4 mm 6
Sept. 14 Partly cloudy
Partly cloudy
 32° /16° 0 mm 1.6
Sept. 15 Patchy rain possible
Patchy rain possible
 31° /15° 0.1 mm 1
Sept. 16 Moderate rain
Moderate rain
 25° /18° 14.3 mm 1.5
Sept. 17 Patchy rain possible
Patchy rain possible
 31° /17° 0.2 mm 1.4
Sept. 18 Sunny
Sunny
 32° /16° 0 mm 0
Sept. 19 Sunny
Sunny
 32° /18° 0.1 mm 6
Sept. 20 Sunny
Sunny
 32° /18° 0 mm 6
Sept. 21 Patchy rain possible
Patchy rain possible
 29° /18° 1.1 mm 5
Sept. 22 Sunny
Sunny
 30° /17° 0.1 mm 6
Sept. 23 Patchy rain possible
Patchy rain possible
 26° /17° 0.7 mm 4
Sept. 24 Patchy rain possible
Patchy rain possible
 27° /16° 3.3 mm 4
Sept. 25 Mist
Mist
 28° /15° 0 mm 5
Sept. 26 Sunny
Sunny
 29° /14° 0 mm 6
Sept. 27 Sunny
Sunny
 31° /15° 0 mm 6
Sept. 28 Thundery outbreaks possible
Thundery outbreaks possible
 24° /16° 10.5 mm 5
Sept. 29 Light rain shower
Light rain shower
 24° /14° 2.5 mm 5
Sept. 30 Mist
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.
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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 ☀️

Quick links

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Location coordinates Where is Knoxville?

Get accurate weather forecasts for Knoxville, located at latitude 35.961 and longitude -83.921. Stay updated with localized weather information tailored for Knoxville.

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