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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.

  • Knoxville sees moderate rainfall in September, averaging 10 rainy days.

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Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/16°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
66 %
Avg humidity

Knoxville in September average weather

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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
Overcast
29° /18° 3.2 mm 7
Sept. 2 Overcast
Overcast
32° /18° 0 mm 7
Sept. 3 Mist
Mist
30° /17° 0 mm 7
Sept. 4 Mist
Mist
32° /18° 0 mm 7
Sept. 5 Fog
Fog
31° /18° 0 mm 7
Sept. 6 Light rain shower
Light rain shower
30° /19° 1.8 mm 7
Sept. 7 Fog
Fog
27° /16° 0.4 mm 6
Sept. 8 Cloudy
Cloudy
28° /13° 0 mm 7
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
29° /14° 0.8 mm 7
Sept. 10 Light rain shower
Light rain shower
30° /15° 2 mm 7
Sept. 11 Fog
Fog
31° /16° 0.2 mm 8
Sept. 12 Mist
Mist
26° /16° 0.4 mm 6
Sept. 13 Mist
Mist
24° /16° 2.2 mm 6
Sept. 14 Cloudy
Cloudy
27° /17° 0.5 mm 6
Sept. 15 Cloudy
Cloudy
29° /15° 0 mm 7
Sept. 16 Light rain shower
Light rain shower
28° /16° 1.2 mm 7
Sept. 17 Light rain shower
Light rain shower
25° /16° 3.7 mm 6
Sept. 18 Overcast
Overcast
24° /15° 0 mm 6
Sept. 19 Partly cloudy
Partly cloudy
26° /16° 0 mm 7
Sept. 20 Partly cloudy
Partly cloudy
30° /16° 0 mm 8
Sept. 21 Overcast
Overcast
30° /17° 2.3 mm 7
Sept. 22 Partly cloudy
Partly cloudy
30° /19° 24.3 mm 7
Sept. 23 Cloudy
Cloudy
29° /17° 43 mm 7
Sept. 24 Cloudy
Cloudy
30° /17° 1.9 mm 7
Sept. 25 Mist
Mist
26° /17° 5.5 mm 6
Sept. 26 Partly cloudy
Partly cloudy
26° /17° 46.4 mm 7
Sept. 27 Patchy rain possible
Patchy rain possible
27° /17° 47.5 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
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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 29° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Knoxville during September?
In September, Knoxville 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 Knoxville during September?
The average wind speed in Knoxville during September is 10 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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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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