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United States weather

Weather in Westchester County, New York for September 2025

Your guide to Westchester County weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Rip Current Statement - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Westchester County is cooler than usual, with temperatures averaging 24.2 °F, this is -2.5 °F below the typical seasonal average.

  • Expect cooler weather in the next days in Westchester County with the forecast suggesting a temperature of 24.2 °F, lower than the historical average.

  • In general, the average temperature in Westchester County at the beginning of September is 27.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.1 °F by the end of September.

    • Rain 🌧️

  • Westchester County in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 166.9 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/16°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Westchester County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
26°
2
Partly cloudy
28°
3
Partly cloudy
28°
4
Partly cloudy
28°
5
Partly cloudy
30°
6
Partly cloudy
29°
7
Thundery outbreaks possible
24°
8
Thundery outbreaks possible
26°
9
Partly cloudy
26°
10
Light rain shower
25°
11
Light rain shower
27°
12
Mist
27°
13
Moderate or heavy rain shower
26°
14
Cloudy
26°
15
Overcast
24°
16
Overcast
24°
17
Weather Alert Patchy rain possible
19°
18
Cloudy
29°
19
Sunny
27°
20
Sunny
23°
21
Sunny
22°
22
Partly cloudy
24°
23
Partly cloudy
26°
24
Partly cloudy
28°
25
Sunny
29°
26
Patchy rain possible
29°
27
Moderate rain
22°
28
Moderate rain
20°
29
Patchy rain possible
21°
30
Patchy rain possible
20°

Temperatures trend during September in Westchester County

See the weather trend as well as the moving average line

September weather in Westchester County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 26° /17° 1.2 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 28° /17° 0 mm 7
Sept. 3 Partly cloudy
Partly cloudy
 28° /16° 0 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 28° /18° 0 mm 7
Sept. 5 Partly cloudy
Partly cloudy
 30° /19° 15 mm 7
Sept. 6 Partly cloudy
Partly cloudy
 29° /21° 15.5 mm 6
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 24° /17° 34.1 mm 6
Sept. 8 Thundery outbreaks possible
Thundery outbreaks possible
 26° /15° 1 mm 6
Sept. 9 Partly cloudy
Partly cloudy
 26° /16° 2.8 mm 6
Sept. 10 Light rain shower
Light rain shower
 25° /17° 1.8 mm 6
Sept. 11 Light rain shower
Light rain shower
 27° /16° 1.7 mm 7
Sept. 12 Mist
Mist
 27° /17° 0 mm 6
Sept. 13 Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /17° 8.9 mm 6
Sept. 14 Cloudy
Cloudy
 26° /17° 0.5 mm 6
Sept. 15 Overcast
Overcast
 24° /16° 0 mm 6
Sept. 16 Overcast
Overcast
 24° /16° 0 mm 5
Sept. 17 Patchy rain possible
Patchy rain possible
 19° /15° 2.6 mm 0.6
Sept. 18 Cloudy
Cloudy
 29° /19° 0 mm 1
Sept. 19 Sunny
Sunny
 27° /18° 0 mm 1.4
Sept. 20 Sunny
Sunny
 23° /12° 0 mm 1.4
Sept. 21 Sunny
Sunny
 22° /15° 0 mm 0
Sept. 22 Partly cloudy
Partly cloudy
 24° /16° 0 mm 5
Sept. 23 Partly cloudy
Partly cloudy
 26° /18° 0 mm 6
Sept. 24 Partly cloudy
Partly cloudy
 28° /19° 0 mm 6
Sept. 25 Sunny
Sunny
 29° /19° 0 mm 6
Sept. 26 Patchy rain possible
Patchy rain possible
 29° /21° 2.7 mm 5
Sept. 27 Moderate rain
Moderate rain
 22° /19° 7.8 mm 5
Sept. 28 Moderate rain
Moderate rain
 20° /19° 7.3 mm 4
Sept. 29 Patchy rain possible
Patchy rain possible
 21° /18° 0.2 mm 4
Sept. 30 Patchy rain possible
Patchy rain possible
 20° /19° 1.1 mm 4
Next
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.
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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 166.9 mm is expected in Westchester County during September, occurring over more than 16 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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Location coordinates Where is Westchester County?

Get accurate weather forecasts for Westchester County, located at latitude 40.931 and longitude -73.899. Stay updated with localized weather information tailored for Westchester County.

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