New York weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: April – October
What is the weather like in New York in September?
In September, New York is warm: daytime highs average 24 °C, and nights cool down to about 16 °C. The sea averages 21.6 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 96 mm in total. All in all, September is a good month for a holiday in New York.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 74 | 78 | 77 |
| Day | 28° | 24° | 18° |
| Night | 20° | 16° | 10° |
| Sea | 23° | 22° | 18° |
| Sun | 7 h | 6 h | 5 h |
| Rain days | 11 | 9 | 9 |
More details for September
- Daylight
- 12 h 32 min06:35 – 19:07
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 7 daysdew point 18 °C or more
- Wind
- 15 km/haverage daily peak
- Cloud cover
- 53 %on average
- Hot days
- 2 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %47 %
- Few rainy daysweight 30 %63 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
New York in September: quick answers
Is New York hot in September?
Warm rather than hot: in September, daytime highs in New York average 24 °C and nights cool to about 16 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in New York in September?
Yes. In September the sea averages 21.6 °C – refreshing for a swim.
Does it rain much in New York in September?
Rain is frequent, with about 9 rainy days and 96 mm in total.
New York month by month
The whole year in New YorkAll destinations: USAWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)