Brooklyn weather in September
In September, Brooklyn has an average high of 23 °C74 °F and an average low of 18 °C64 °F, with about 97 mm3.8 in of precipitation. It is the 3rd warmest month of the year and ranks 11th for precipitation.
How September compares with other months
Compared with August, September is 3.1 °C5.6 °F cooler on average and drier by 17 mm0.7 in. Compared with October, September is 5.7 °C10.2 °F warmer on average and drier by 27 mm1.1 in. Daylight lasts about 12.4 hours around the middle of the month. Average relative humidity is 77% and the average cloud amount 48%.
Is September a good time to visit Brooklyn?
Yes — September is one of the most comfortable months to visit Brooklyn by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in September
For Brooklyn in September, pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Brooklyn | 2374 | 1864 | 973.8 |
| New York City | 2374 | 1864 | 973.8 |
| Manhattan | 2577 | 1559 | 1054.1 |
| Staten Island | 2678 | 1559 | 983.8 |
| Paterson | 2679 | 1457 | 1094.3 |
| Stamford | 2578 | 1559 | 1054.1 |
| Bridgeport | 2475 | 1763 | 993.9 |
| New Haven | 2578 | 1457 | 1064.2 |
| Waterbury | 2577 | 1356 | 1064.2 |
Nearby places that are more than 1 °C1.8 °F cooler: New Haven and Waterbury.
Other months in Brooklyn
- January4 °C38 °F / −1 °C29 °F
- February4 °C39 °F / −1 °C30 °F
- March7 °C44 °F / 1 °C35 °F
- April12 °C54 °F / 6 °C43 °F
- May17 °C63 °F / 12 °C53 °F
- June22 °C72 °F / 17 °C63 °F
- July26 °C79 °F / 21 °C70 °F
- August26 °C79 °F / 21 °C70 °F
- September23 °C74 °F / 18 °C64 °F
- October18 °C64 °F / 12 °C54 °F
- November12 °C53 °F / 7 °C44 °F
- December7 °C44 °F / 2 °C36 °F
Frequently asked questions
How warm is Brooklyn in September?
In September the average high in Brooklyn is 23 °C (74 °F) and the average low is 18 °C (64 °F).
Does it rain a lot in Brooklyn in September?
On average about 97 mm (3.8 in) of precipitation falls in September; it ranks 11th of the 12 months.
Is September the warmest month in Brooklyn?
No. The warmest month in Brooklyn is July, with an average high of 26 °C (79 °F). The coldest month is January, with an average low of -1 °C (29 °F).
How long is the day in Brooklyn in September?
In the middle of September the day in Brooklyn lasts about 12.4 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Brooklyn in September?
The average relative humidity in September is about 77%. This is a long-term average for the whole day.
How cloudy is Brooklyn in September?
On average about 48% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.