Johnson City (TN)
September
Weather in Johnson City, Tennessee for September 2026
Your guide to Johnson City weather in September - trends and predictions
So far, September 2026 in Johnson City shows a warmer trend than usual by 3.8 °F.
Expect cooler weather in the next days in Johnson City with the forecast suggesting a temperature of 20.2 °F, lower than the historical average.
In general, the average temperature in Johnson City at the beginning of September is 28.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19 °F by the end of September.
Johnson City experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 96 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
24°/14°
Temperatures
9 km/h
Avg max wind
77 %
Avg humidity
Johnson City Weather September
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Temperatures trend during September in Johnson City
See the weather trend as well as the moving average line
September weather in Johnson City day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 29° /17° | 0 mm | 8 | |
| Sept. 2 | Overcast | 29° /16° | 0 mm | 8 | |
| Sept. 3 | Overcast | 29° /16° | 0 mm | 8 | |
| Sept. 4 |  Light rain shower | 31° /17° | 6.3 mm | 8 | |
| Sept. 5 |  Moderate or heavy rain shower | 31° /18° | 6 mm | 8 | |
| Sept. 6 | Light rain shower | 27° /18° | 6.4 mm | 7 | |
| Sept. 7 |  Light rain | 24° /16° | 3.3 mm | 6 | |
| Sept. 8 |  Sunny | 26° /11° | 0 mm | 8 | |
| Sept. 9 | Sunny | 27° /14° | 0 mm | 8 | |
| Sept. 10 |  Partly cloudy | 25° /13° | 0 mm | 8 | |
| Sept. 11 |  Fog | 27° /14° | 0.1 mm | 7 | |
| Sept. 12 | Partly cloudy | 26° /15° | 36.2 mm | 4 | |
| Sept. 13 | Fog | 25° /14° | 1.1 mm | 5 | |
| Sept. 14 | Mist | 25° /16° | 0.1 mm | 6 | |
| Sept. 15 |  Cloudy | 26° /16° | 0 mm | 7 | |
| Sept. 16 | Mist | 23° /15° | 0.1 mm | 6 | |
| Sept. 17 | Cloudy | 26° /16° | 0.4 mm | 7 | |
| Sept. 18 | Mist | 26° /17° | 2.4 mm | 6 | |
| Sept. 19 | Partly cloudy | 29° /15° | 0 mm | 7 | |
| Sept. 20 | Mist | 26° /18° | 3.5 mm | 7.6 | |
| Sept. 21 | Light rain shower | 27° /17° | 7.1 mm | 7.4 | |
| Sept. 22 | Light rain shower | 24° /18° | 10.7 mm | 5.8 | |
| Sept. 23 | Light rain shower | 19° /12° | 21.9 mm | 5.8 | |
| Sept. 24 | Light rain shower | 16° /12° | 10 mm | 5 | |
| Sept. 25 | Sunny | 19° /14° | 0 mm | 5 | |
| Sept. 26 | Sunny | 21° /13° | 0 mm | 5 | |
| Sept. 27 | Sunny | 17° /11° | 0 mm | 5 | |
| Sept. 28 | Sunny | 19° /11° | 0 mm | 5 | |
| Sept. 29 | Overcast | 20° /13° | 0 mm | 5 | |
| Sept. 30 | Overcast | 21° /15° | 0.9 mm | 5 | |
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Important Notice
Our weather forecast for Johnson City 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 Johnson City forecast closer to your planned date for the most up-to-date weather information.
Change Month
Johnson City in September - FAQ
What are the expected maximum and minimum temperatures in Johnson City during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Johnson City during September?
Moderate rainfall is anticipated in Johnson City during September, with a total of 96 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Johnson City during September?
The average wind speed in Johnson City during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Johnson City
Explore the daily rainfall trends and prepare for Johnson Citys September weather 💧
Typically, Johnson City has 9 rainy days in September with a total of 96 mm of rainfall.
UV exposure in Johnson City during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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