Washington County (Fayetteville)
September
Weather in Washington County, Arkansas for September 2026
Your guide to Washington County weather in September - trends and predictions
So far, September 2026 in Washington County shows a warmer trend than usual by 4.7 °F.
Expect cooler weather in the next days in Washington County with the forecast suggesting a temperature of 26.2 °F, lower than the historical average.
In general, the average temperature in Washington County at the beginning of September is 30.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.6 °F by the end of September.
The climate of Washington County in September is notably wet, with an average of 11 rainy days, and a total of 186.9 mm of precipitation.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
19
Dry days
11
Rainy days
0
Snow days
27°/18°
Temperatures
15 km/h
Avg max wind
67 %
Avg humidity
Washington County Weather September
Move between months or click on a day
Temperatures trend during September in Washington County
See the weather trend as well as the moving average line
September weather in Washington County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate or heavy rain shower | 31° /21° | 2.7 mm | 7 | |
| Sept. 2 |  Sunny | 31° /19° | 3.4 mm | 8 | |
| Sept. 3 |  Partly cloudy | 30° /19° | 0 mm | 7 | |
| Sept. 4 |  Overcast | 29° /19° | 0 mm | 7 | |
| Sept. 5 |  Patchy rain possible | 32° /19° | 0.1 mm | 7 | |
| Sept. 6 | Patchy rain possible | 30° /18° | 4.8 mm | 7 | |
| Sept. 7 | Sunny | 30° /16° | 0 mm | 7 | |
| Sept. 8 | Sunny | 30° /15° | 0 mm | 7 | |
| Sept. 9 | Sunny | 30° /17° | 0 mm | 7 | |
| Sept. 10 | Sunny | 29° /17° | 27 mm | 5 | |
| Sept. 11 | Moderate rain at times | 30° /20° | 1.3 mm | 5 | |
| Sept. 12 | Patchy rain possible | 31° /19° | 1.8 mm | 7 | |
| Sept. 13 | Patchy rain possible | 30° /20° | 1.1 mm | 5 | |
| Sept. 14 | Partly cloudy | 32° /19° | 0.3 mm | 8 | |
| Sept. 15 | Overcast | 31° /21° | 2 mm | 7 | |
| Sept. 16 | Patchy rain possible | 31° /21° | 0.2 mm | 7 | |
| Sept. 17 | Patchy rain possible | 31° /21° | 0.3 mm | 7 | |
| Sept. 18 | Patchy rain possible | 31° /22° | 4.6 mm | 7 | |
| Sept. 19 | Sunny | 30° /20° | 0.6 mm | 7 | |
| Sept. 20 | Overcast | 34° /22° | 0.3 mm | 7.7 | |
| Sept. 21 | Sunny | 30° /21° | 2.4 mm | 7.5 | |
| Sept. 22 | Partly cloudy | 26° /16° | 0.7 mm | 6.2 | |
| Sept. 23 | Sunny | 29° /16° | 0 mm | 7.7 | |
| Sept. 24 | Overcast | 29° /17° | 0 mm | 7 | |
| Sept. 25 | Overcast | 28° /20° | 0.3 mm | 6 | |
| Sept. 26 | Sunny | 27° /19° | 0.9 mm | 7 | |
| Sept. 27 | Overcast | 24° /12° | 0 mm | 5 | |
| Sept. 28 | Overcast | 26° /20° | 0 mm | 6 | |
| Sept. 29 | Overcast | 24° /17° | 0.9 mm | 5 | |
| Sept. 30 | Overcast | 21° /15° | 10.2 mm | 5 | |
| Next | |||||
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.
Change Month
Washington County in September - FAQ
What are the expected maximum and minimum temperatures in Washington County during September?
During September, expect a variety of temperatures with highs around 27° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Washington County during September?
Significant rainfall exceeding 186.9 mm is expected in Washington County during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Washington County during September?
The average wind speed in Washington County during September is 15 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 💧
Typically, Washington County has 11 rainy days in September with a total of 186.9 mm of rainfall.
UV exposure in Washington County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Washington County
Select a location for an accurate weather forecast
More Locations Quick links
More Washington County weather pages
You are here
Where is Washington County?Get accurate weather forecasts for Washington County, located at latitude 36.063 and longitude -94.157. Stay updated with localized weather information tailored for Washington County.
Found a mistake?
We appreciate your attention to details. Tell us here.