Brooklyn Weather in September
September in Brooklyn typically sees daytime highs of 25°C (77°F) and nighttime lows of 18°C (64°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Brooklyn in September
Typically, about 10 days will experience rainfall, with an average of 90 mm (3.5 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Brooklyn in September
September is a perfect month in Brooklyn, with 25°C (77°F) during the day and 18°C (64°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 18°C (64°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Brooklyn in September
The city usually sees around 218 hours of sunlight, indicating many sunny days — a great month for sightseeing.
Wind Speed in Brooklyn in September
Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.
Average water temperature in September
The water is 20°C (68°F) this month — a comfortable temperature that most swimmers enjoy. Warm enough to stay in without getting cold quickly.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
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 Brooklyn's climate page.
Brooklyn Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
25°C (77°F)
Water Temperature
20°C (68°F) *
Chance of Rain
32%
Precipitation
90 mm (3.5 in)
Rainy days
10 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 Brooklyn 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 19°C (66°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 Brooklyn in September
Browse day-by-day weather records for Brooklyn spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Brooklyn historical weather extremes in September
Based on 49 years of weather observations in Brooklyn between 1976 and 2025, these are the recorded extremes.
- Brooklyn recorded its highest September temperature of 36°C (97°F) on September 11, 1983.
- The coldest September day was on September 28, 1984, with a maximum of 12°C (54°F).
- Brooklyn registered its coldest September night on September 29, 2000, 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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tolerable
unpleasant
poor
What to Wear in Brooklyn in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 20°C (68°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Brooklyn 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 Brooklyn's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Brooklyn climate overview or explore weather in the United States of America.
