Westchester County (Yonkers)
September
Weather in Westchester County, New York for September 2026
Your guide to Westchester County weather in September - trends and predictions
The forecast for the first days of September 2026 in Westchester County predicts a temperature of 27.8 °F, which is slightly above the historical average.
In general, the average temperature in Westchester County at the beginning of September is 27.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.4 °F by the end of September.
Westchester County in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 208.5 mm.
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Temperatures
Rain 🌧️
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11
Dry days
19
Rainy days
0
Snow days
24°/16°
Temperatures
15 km/h
Avg max wind
69 %
Avg humidity
Westchester County Weather September
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Temperatures trend during September in Westchester County
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September weather in Westchester County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 30° /21° | 11.9 mm | 7 | |
| Sept. 2 | Patchy rain possible | 21° /19° | 0.1 mm | 5 | |
| Sept. 3 | Light rain shower | 31° /20° | 4.1 mm | 7 | |
| Sept. 4 |  Sunny | 32° /21° | 1.4 mm | 8 | |
| Sept. 5 | Light rain shower | 28° /21° | 18.2 mm | 6 | |
| Sept. 6 | Patchy rain possible | 24° /19° | 0.4 mm | 6 | |
| Sept. 7 | Sunny | 26° /18° | 0 mm | 7 | |
| Sept. 8 | Sunny | 26° /15° | 0 mm | 7 | |
| Sept. 9 |  Overcast | 26° /18° | 0 mm | 6 | |
| Sept. 10 | Light rain shower | 25° /17° | 1.8 mm | 6 | |
| Sept. 11 | Light rain shower | 27° /16° | 1.7 mm | 7 | |
| Sept. 12 |  Mist | 27° /17° | 0 mm | 6 | |
| Sept. 13 |  Moderate or heavy rain shower | 26° /17° | 8.9 mm | 6 | |
| Sept. 14 |  Cloudy | 26° /17° | 0.5 mm | 6 | |
| Sept. 15 | Overcast | 24° /16° | 0 mm | 6 | |
| Sept. 16 | Overcast | 24° /16° | 0 mm | 5 | |
| Sept. 17 |  Light drizzle | 23° /15° | 0.5 mm | 5 | |
| Sept. 18 | Mist | 23° /17° | 9.4 mm | 5 | |
| Sept. 19 | Sunny | 25° /17° | 0 mm | 6 | |
| Sept. 20 | Sunny | 22° /14° | 2.3 mm | 6 | |
| Sept. 21 |  Partly cloudy | 23° /14° | 0 mm | 5 | |
| Sept. 22 | Patchy rain possible | 22° /14° | 0 mm | 5 | |
| Sept. 23 | Overcast | 21° /15° | 16.5 mm | 5 | |
| Sept. 24 | Overcast | 21° /15° | 2.9 mm | 5 | |
| Sept. 25 | Moderate or heavy rain shower | 19° /16° | 34.9 mm | 4 | |
| Sept. 26 | Patchy rain possible | 24° /16° | 12.2 mm | 5 | |
| Sept. 27 | Overcast | 23° /14° | 4.5 mm | 5 | |
| Sept. 28 | Overcast | 22° /15° | 24.4 mm | 5 | |
| Sept. 29 | Moderate or heavy rain shower | 20° /15° | 13.8 mm | 5 | |
| Sept. 30 | Overcast | 21° /15° | 4.5 mm | 5 | |
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Important Notice
Our weather forecast for Westchester 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 Westchester County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Westchester County in September - FAQ
What are the expected maximum and minimum temperatures in Westchester County during September?
During September, expect a variety of temperatures with highs around 24° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Westchester County during September?
Significant rainfall exceeding 208.5 mm is expected in Westchester County during September, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Westchester County during September?
The average wind speed in Westchester County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Westchester County
Explore the daily rainfall trends and prepare for Westchester Countys September weather 💧
Typically, Westchester County has 19 rainy days in September with a total of 208.5 mm of rainfall.
UV exposure in Westchester County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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