Washington County (Johnson City)
September
Weather in Washington County, Tennessee for September 2026
Your guide to Washington County weather in September - trends and predictions
In general, the average temperature in Washington County at the beginning of September is 23.4 °F. As the month progressed, temperatures tended to slightly increase, reaching an average of 23.6 °F by the end of September.
Washington County 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
Washington County Weather September
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Temperatures trend during September in Washington County
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September weather in Washington County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 23° /14° | 0 mm | 5 | |
| Sept. 2 | Overcast | 22° /13° | 0 mm | 5 | |
| Sept. 3 | Overcast | 22° /13° | 0 mm | 5 | |
| Sept. 4 |  Light rain shower | 25° /14° | 12.5 mm | 6 | |
| Sept. 5 |  Moderate or heavy rain shower | 29° /17° | 12 mm | 6 | |
| Sept. 6 | Light rain shower | 24° /16° | 12.5 mm | 5 | |
| Sept. 7 |  Light rain | 19° /13° | 6.7 mm | 4 | |
| Sept. 8 |  Sunny | 20° /8° | 0 mm | 6 | |
| Sept. 9 | Sunny | 23° /10° | 0 mm | 6 | |
| Sept. 10 |  Partly cloudy | 20° /9° | 0 mm | 6 | |
| Sept. 11 |  Fog | 21° /9° | 0 mm | 5 | |
| Sept. 12 | Partly cloudy | 23° /11° | 0 mm | 6 | |
| Sept. 13 | Fog | 24° /10° | 0 mm | 5 | |
| Sept. 14 | Mist | 24° /13° | 0 mm | 5 | |
| Sept. 15 |  Cloudy | 24° /15° | 0 mm | 5 | |
| Sept. 16 | Mist | 18° /12° | 0 mm | 4 | |
| Sept. 17 | Cloudy | 23° /13° | 0 mm | 5 | |
| Sept. 18 | Mist | 24° /14° | 0 mm | 5 | |
| Sept. 19 | Partly cloudy | 29° /15° | 0 mm | 7 | |
| Sept. 20 |  Thundery outbreaks possible | 25° /13° | 0 mm | 6 | |
| Sept. 21 | Cloudy | 27° /16° | 0 mm | 6 | |
| Sept. 22 | Thundery outbreaks possible | 27° /17° | 1.1 mm | 6 | |
| Sept. 23 | Overcast | 24° /16° | 0 mm | 5 | |
| Sept. 24 | Moderate or heavy rain shower | 26° /18° | 17.2 mm | 6 | |
| Sept. 25 | Light rain shower | 23° /19° | 15.8 mm | 5 | |
| Sept. 26 | Light rain shower | 24° /18° | 3.4 mm | 5 | |
| Sept. 27 |  Moderate rain | 21° /16° | 14.8 mm | 5 | |
| Sept. 28 | Fog | 23° /14° | 0 mm | 5 | |
| Sept. 29 | Fog | 24° /10° | 0 mm | 5 | |
| Sept. 30 | Mist | 24° /15° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Washington 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 Washington County forecast closer to your planned date for the most up-to-date weather information.
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Washington County in September - FAQ
What are the expected maximum and minimum temperatures in Washington County 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 Washington County during September?
Moderate rainfall is anticipated in Washington County 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 Washington County during September?
The average wind speed in Washington County during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Washington County
Explore the daily rainfall trends and prepare for Washington Countys September weather 💧
UV exposure in Washington County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Washington County?Get accurate weather forecasts for Washington County, located at latitude 36.313 and longitude -82.353. Stay updated with localized weather information tailored for Washington County.
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