Weather in New York City for September 2025
In general, the average temperature in New York City at the beginning of September is 27.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21 °F by the end of September.
New York City experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 150 mm.
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New York City in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2  26° | 3  27° | 4 29° | 5  27° | 6  28° | 7 27° |
| 8  27° | 9 28° | 10 27° | 11 26° | 12 28° | 13 27° | 14 27° |
| 15 26° | 16 25° | 17 24° | 18 25° | 19 26° | 20 24° | 21 25° |
| 22 23° | 23 20° | 24 21° | 25 21° | 26 23° | 27 23° | 28 21° |
| 29 19° | 30 19° |
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Temperatures trend during September in New York City
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 27° /18° | 12.8 mm | 7 | |
| Sept. 2 | Moderate or heavy rain shower | 26° /16° | 7 mm | 6 | |
| Sept. 3 | Partly cloudy | 27° /17° | 0 mm | 7 | |
| Sept. 4 | Sunny | 29° /19° | 0.8 mm | 7 | |
| Sept. 5 | Patchy rain possible | 27° /20° | 1.1 mm | 7 | |
| Sept. 6 | Overcast | 28° /20° | 5.7 mm | 6 | |
| Sept. 7 | Partly cloudy | 27° /18° | 3 mm | 7 | |
| Sept. 8 | Cloudy | 27° /18° | 1.4 mm | 6 | |
| Sept. 9 | Moderate or heavy rain shower | 28° /18° | 6 mm | 6 | |
| Sept. 10 | Sunny | 27° /18° | 1.2 mm | 7 | |
| Sept. 11 | Sunny | 26° /18° | 4.2 mm | 6 | |
| Sept. 12 | Sunny | 28° /18° | 1.5 mm | 7 | |
| Sept. 13 | Moderate or heavy rain shower | 27° /19° | 14.8 mm | 7 | |
| Sept. 14 | Overcast | 27° /18° | 0 mm | 6 | |
| Sept. 15 | Cloudy | 26° /17° | 0.3 mm | 6 | |
| Sept. 16 | Patchy rain possible | 25° /16° | 0.3 mm | 6 | |
| Sept. 17 | Patchy rain possible | 24° /17° | 0.4 mm | 6 | |
| Sept. 18 | Patchy rain possible | 25° /18° | 7.2 mm | 6 | |
| Sept. 19 | Sunny | 26° /17° | 3.7 mm | 6 | |
| Sept. 20 | Sunny | 24° /17° | 0.8 mm | 6 | |
| Sept. 21 | Overcast | 25° /15° | 0 mm | 6 | |
| Sept. 22 | Patchy rain possible | 23° /15° | 3.2 mm | 6 | |
| Sept. 23 | Moderate or heavy rain shower | 20° /14° | 15.7 mm | 5 | |
| Sept. 24 | Moderate or heavy rain shower | 21° /13° | 6.3 mm | 5 | |
| Sept. 25 | Partly cloudy | 21° /14° | 18.5 mm | 5 | |
| Sept. 26 | Overcast | 23° /15° | 12 mm | 5 | |
| Sept. 27 | Overcast | 23° /14° | 4.2 mm | 5 | |
| Sept. 28 | Overcast | 21° /14° | 1 mm | 5 | |
| Sept. 29 | Partly cloudy | 19° /13° | 12.1 mm | 5 | |
| Sept. 30 | Cloudy | 19° /13° | 4.7 mm | 4 | |
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Guide for New York City in September
In September, New York City experiences a transition from the warmth of summer to the crispness of fall. At the beginning of the month, the weather in New York City is typically still quite warm, with temperatures averaging around 25° during the day and 18° at night.
The city is often still experiencing the tail end of summer, with occasional hot and humid days, perfect for enjoying outdoor activities and exploring the city's many attractions.
As the month progresses, the weather gradually cools down, and by the end of September, the temperatures in New York City have usually dropped to an average of 20° during the day and 13° at night. The humidity decreases, and there is a noticeable crispness in the air as fall sets in.
This transition makes for pleasant strolls through Central Park or along the High Line, and the city's vibrant fall foliage starts to make an appearance.
Overall, September in New York City offers a delightful mix of warm and cool weather, making it an ideal time to visit for those who enjoy the changing seasons.
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New York City in September - FAQ
September rainfall patterns in New York City
UV exposure in New York City during September
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