Last updated: June 24, 2025
In September, the average temperature in Brooklyn, United States is a pleasant 19°C (66°F). Expect swings in temperature, with a minimum dipping to 2°C (37°F) and a maximum reaching up to 33°C (91°F). This month brings about 63 mm (2.5 in) of precipitation over 8 days, contributing to a high average humidity of 78%. Prepare for a mix of warmth and moisture during your stay!
In September in Brooklyn, the average temperature is 19°C (66°F). The maximum can reach 33°C (91°F) and the minimum can be as low as 2°C (37°F). This varying climate makes Brooklyn a versatile destination for travelers seeking both warm and cool experiences.
In Brooklyn in September, the precipitation amount is 63 mm (2.5 in) spread over 8 days.
In Brooklyn in September, humidity is 78%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making traveling quite uncomfortable unless you're well-prepared with lightweight, breathable clothing and frequent breaks to stay hydrated.
In Brooklyn in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Brooklyn.
UV Risk Categories
Weather in Brooklyn varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brooklyn, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 68 mm (2.7 inches) | 88% | moderate |
| February Weather | -2°C (28°F) | 69 mm (2.7 inches) | 87% | moderate |
| March Weather | 3°C (38°F) | 85 mm (3.3 inches) | 87% | moderate |
| April Weather | 8°C (47°F) | 93 mm (3.7 inches) | 87% | very high |
| May Weather | 15°C (60°F) | 133 mm (5.3 inches) | 81% | very high |
| June Weather | 21°C (70°F) | 92 mm (3.6 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 112 mm (4.4 inches) | 81% | very high |
| August Weather | 22°C (72°F) | 71 mm (2.8 inches) | 78% | very high |
| September Weather | 19°C (66°F) | 63 mm (2.5 inches) | 78% | very high |
| October Weather | 12°C (54°F) | 110 mm (4.3 inches) | 82% | high |
| November Weather | 4°C (39°F) | 82 mm (3.2 inches) | 89% | moderate |
| December Weather | 0°C (33°F) | 55 mm (2.2 inches) | 86% | low |