Westchester County (Yonkers)
September
Weather in Westchester County for September 2025
Your guide to Westchester County weather in September - trends and predictions
In general, the average temperature in Westchester County at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.3 °F by the end of September.
The climate of Westchester County in September is notably wet, with an average of 15 rainy days.
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15
Dry days
15
Rainy days
0
Snow days
25°/16°
Temperatures
16 km/h
Avg max wind
70 %
Avg humidity
Westchester County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2  28° | 3 29° | 4 30° | 5 30° | 6 29° | 7  28° |
| 8 26° | 9  28° | 10  27° | 11 28° | 12  28° | 13  26° | 14  26° |
| 15  24° | 16 24° | 17  24° | 18 21° | 19 24° | 20 23° | 21 24° |
| 22 21° | 23  18° | 24 19° | 25  17° | 26 21° | 27 21° | 28 20° |
| 29 17° | 30 20° |
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Temperatures trend during September in Westchester County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 27° /18° | 1.8 mm | 7 | |
| Sept. 2 | Partly cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 3 | Partly cloudy | 29° /16° | 0 mm | 7 | |
| Sept. 4 | Partly cloudy | 30° /19° | 0 mm | 8 | |
| Sept. 5 | Partly cloudy | 30° /20° | 0.2 mm | 8 | |
| Sept. 6 | Partly cloudy | 29° /20° | 0 mm | 7 | |
| Sept. 7 | Thundery outbreaks possible | 28° /19° | 3.6 mm | 7 | |
| Sept. 8 | Thundery outbreaks possible | 26° /17° | 1.5 mm | 7 | |
| Sept. 9 | Patchy light rain with thunder | 28° /17° | 4.2 mm | 7 | |
| Sept. 10 | Light rain shower | 27° /19° | 2.7 mm | 7 | |
| Sept. 11 | Light rain shower | 28° /17° | 2.5 mm | 7 | |
| Sept. 12 | Mist | 28° /17° | 0 mm | 7 | |
| Sept. 13 | Moderate or heavy rain shower | 26° /17° | 13.4 mm | 6 | |
| Sept. 14 | Cloudy | 26° /17° | 0.8 mm | 6 | |
| Sept. 15 | Overcast | 24° /16° | 0 mm | 6 | |
| Sept. 16 | Overcast | 24° /15° | 0 mm | 5 | |
| Sept. 17 | Light drizzle | 24° /15° | 0.8 mm | 6 | |
| Sept. 18 | Light rain shower | 21° /16° | 14.1 mm | 5 | |
| Sept. 19 | Sunny | 24° /16° | 0 mm | 6 | |
| Sept. 20 | Sunny | 23° /15° | 3.4 mm | 6 | |
| Sept. 21 | Partly cloudy | 24° /14° | 0 mm | 6 | |
| Sept. 22 | Patchy rain possible | 21° /13° | 0 mm | 6 | |
| Sept. 23 | Heavy rain | 18° /13° | 24.7 mm | 4 | |
| Sept. 24 | Light rain shower | 19° /13° | 2.6 mm | 5 | |
| Sept. 25 | Moderate rain | 17° /14° | 39.7 mm | 4 | |
| Sept. 26 | Patchy rain possible | 21° /14° | 16.6 mm | 5 | |
| Sept. 27 | Overcast | 21° /13° | 6.7 mm | 5 | |
| Sept. 28 | Overcast | 20° /14° | 0 mm | 5 | |
| Sept. 29 | Moderate or heavy rain shower | 17° /15° | 20.8 mm | 4 | |
| Sept. 30 | Light drizzle | 20° /14° | 6.8 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.
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 25° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Westchester County during September?
Significant rainfall exceeding 242.9 mm is expected in Westchester County during September, occurring over more than 15 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 16 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 💧
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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