Climate averages 1991–2020
Brooklyn weather
in September.
A warm, wet month: the 4th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Brooklyn: daytime highs average 23.8°C and nights cool to about 16.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 94 mm of rain on roughly 9 days, which makes September a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 30 min on an average September day.
The nearest other city in this atlas is New York City (9 km away). In September its highs average 23.6°C, about as warm as Brooklyn, with 94 mm of rain.
Among the 498 cities listed in the United States, Brooklyn ranks joint 366th of 498 for the warmest September highs and joint 365th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Brooklyn is 3.1°C cooler than that mean.
From September to October, average highs fall by 6.3°C to 17.5°C, and monthly rainfall rises from 94 mm to 97 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Brooklyn climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.3°C-4.4°C | -4.4°C | 81 | 9.1 | 9.610 h |
| February | 4.6°C-4.0°C | -4.0°C | 77 | 8.4 | 10.611 h |
| March | 8.8°C-0.2°C | -0.2°C | 105 | 10.2 | 11.912 h |
| April | 14.9°C5.6°C | 5.6°C | 91 | 10.6 | 13.313 h |
| May | 20.3°C11.3°C | 11.3°C | 85 | 10.9 | 14.414 h |
| June | 25.5°C16.9°C | 16.9°C | 100 | 11.2 | 15.015 h |
| July | 28.6°C20.3°C | 20.3°C | 103 | 11.1 | 14.815 h |
| August | 27.5°C19.7°C | 19.7°C | 101 | 10.4 | 13.814 h |
| September, selected | 23.8°C16.1°C | 16.1°C | 94 | 9.4 | 12.513 h |
| October | 17.5°C9.9°C | 9.9°C | 97 | 8.5 | 11.211 h |
| November | 11.4°C3.9°C | 3.9°C | 77 | 8.0 | 10.010 h |
| December | 6.1°C-0.9°C | -0.9°C | 100 | 9.7 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- New York City in SeptemberUnited States · 9 kmHigh 23.6°C · Low 15.6°C · 94 mm rain
- Queens in SeptemberUnited States · 10 kmHigh 23.6°C · Low 16.5°C · 92 mm rain
- Manhattan in SeptemberUnited States · 15 kmHigh 23.7°C · Low 15.6°C · 94 mm rain
- Staten Island in SeptemberUnited States · 19 kmHigh 24.0°C · Low 16.2°C · 95 mm rain
- Newark in SeptemberUnited States · 21 kmHigh 24.2°C · Low 15.6°C · 102 mm rain
- The Bronx in SeptemberUnited States · 23 kmHigh 23.8°C · Low 15.7°C · 92 mm rain
- Passaic in SeptemberUnited States · 27 kmHigh 23.9°C · Low 15.5°C · 102 mm rain
- Yonkers in SeptemberUnited States · 31 kmHigh 23.7°C · Low 15.8°C · 101 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Brooklyn) is explained once on the Brooklyn year overview and on the Sources, method and limits page.
New York City and Manhattan lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.