Washington County (South Kingstown)
September
Weather in Washington County, Rhode Island for September 2026
Your guide to Washington County weather in September - trends and predictions
So far, September 2026 in Washington County is slightly warmer than the historical average by 2 °F.
The forecast for the next days in Washington County predicts temperatures to be around 17 °F, close to the historical average.
In general, the average temperature in Washington County at the beginning of September is 23 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.4 °F by the end of September.
Washington County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 94.3 mm.
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Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
20°/15°
Temperatures
19 km/h
Avg max wind
81 %
Avg humidity
Washington County Weather September
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 22° /17° | 61.1 mm | 4 | |
| Sept. 2 |  Partly cloudy | 24° /16° | 0 mm | 5 | |
| Sept. 3 |  Sunny | 23° /14° | 24.6 mm | 4 | |
| Sept. 4 | Sunny | 24° /16° | 3 mm | 4 | |
| Sept. 5 | Sunny | 23° /16° | 0 mm | 6 | |
| Sept. 6 | Patchy rain possible | 22° /17° | 2.5 mm | 4 | |
| Sept. 7 |  Moderate or heavy rain shower | 23° /13° | 3.8 mm | 6 | |
| Sept. 8 | Sunny | 24° /12° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 23° /14° | 0.5 mm | 5 | |
| Sept. 10 | Partly cloudy | 24° /17° | 0 mm | 4 | |
| Sept. 11 | Sunny | 24° /14° | 0 mm | 6 | |
| Sept. 12 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 13 | Sunny | 22° /15° | 15.2 mm | 4 | |
| Sept. 14 | Sunny | 23° /15° | 0.5 mm | 6 | |
| Sept. 15 |  Cloudy | 21° /13° | 0 mm | 5 | |
| Sept. 16 | Partly cloudy | 21° /13° | 0 mm | 5 | |
| Sept. 17 |  Overcast | 21° /15° | 1.3 mm | 5 | |
| Sept. 18 | Overcast | 22° /16° | 6.6 mm | 3 | |
| Sept. 19 | Moderate or heavy rain shower | 22° /17° | 24.5 mm | 5 | |
| Sept. 20 | Overcast | 18° /12° | 15.4 mm | 0.8 | |
| Sept. 21 | Overcast | 19° /12° | 5.5 mm | 4.4 | |
| Sept. 22 | Overcast | 13° /11° | 4.3 mm | 0.7 | |
| Sept. 23 | Patchy rain possible | 16° /13° | 0.8 mm | 2.8 | |
| Sept. 24 | Patchy rain possible | 14° /13° | 0.1 mm | 3 | |
| Sept. 25 | Light rain shower | 15° /11° | 10.2 mm | 3 | |
| Sept. 26 | Sunny | 20° /12° | 62.5 mm | 5 | |
| Sept. 27 | Light rain shower | 14° /12° | 2.1 mm | 3 | |
| Sept. 28 | Overcast | 19° /12° | 0 mm | 4 | |
| Sept. 29 | Overcast | 19° /13° | 0 mm | 4 | |
| Sept. 30 | Overcast | 21° /12° | 0 mm | 6 | |
| 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 20° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Washington County during September?
Moderate rainfall is anticipated in Washington County during September, with a total of 94.3 mm spread over approximately 10 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 19 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 10 rainy days in September with a total of 94.3 mm of rainfall.
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 41.447 and longitude -71.525. Stay updated with localized weather information tailored for Washington County.
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