New York City Weather in September
September in New York City averages 25°C (77°F) during the day and 18°C (64°F) at night. Quite a bit of rainfall is typical this month, with around 97 mm (3.8 in) on average. An umbrella is a good idea.
Rainfall in New York City in September
Expect around 9 days of rain based on historical data, with 97 mm (3.8 in) average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in New York City in September
September in New York City is generally perfect, with days reaching 25°C (77°F) and nights settling around 18°C (64°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights drop to around 18°C (64°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in New York City in September
Expect a lot of sunshine this month, with about 218 hours of sun. These sunny conditions add to the overall experience.
Wind Speed in New York City in September
September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.
Average water temperature in September
At 20°C (68°F), the water is pleasant for swimming. Most people find this range ideal — cool enough to be refreshing, warm enough to stay in comfortably.Our weather planner can help you find worldwide destinations with pleasant weather during this period. September typically offers the best weather for New York City.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our New York City's climate page.
New York City Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
25°C (77°F)
Water Temperature
20°C (68°F)
Chance of Rain
29%
Precipitation
97 mm (3.8 in)
Rainy days
9 days
Humidity
68%
Windspeed
5 m/s (10 knots)
Sunshine
218 hours
Percentage Sunshine
59%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in New York City typically drop from around 27°C (81°F) at the start of September to approximately 22°C (72°F) by the end. Nights are pleasant, with lows typically ranging from 14°C (57°F) to 20°C (68°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for New York City in September
Browse day-by-day weather records for New York City spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
New York City historical weather extremes in September
According to our 49 years of weather records for New York City, the following extremes were recorded between 1976 and 2025.
- The hottest September day on record in New York City reached 36°C (97°F) (September 6, 2018).
- New York City experienced its chilliest September day on September 30, 2001, reaching only 13°C (55°F).
- New York City registered its coldest September night on September 20, 1979, with temperatures dropping to 6°C (43°F).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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unpleasant
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What to Wear in New York City in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. The water temperature sits at about 20°C (68°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in New York City in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our New York City's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full New York City climate overview or explore weather in the United States of America.
