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September Weather in East Hampton, United States

Last updated: June 24, 2025

In September, the average temperature in East Hampton, United States is a pleasant 19°C (67°F). Expect a minimum chill of 4°C (40°F) and a maximum warmth of 33°C (92°F). With an average humidity of 68%, you might feel a bit sticky at times. Be prepared for some rain, as precipitation typically reaches 97 mm (3.8 in) over about 9 days. Enjoy the varied climate!

September Temperature in East Hampton

In September in East Hampton, the average temperature is 19°C (67°F). Maximums can reach 33°C (92°F) while minimums can be as low as 4°C (40°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities while also being prepared for cooler evenings.

September Weather in East Hampton: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in East Hampton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In East Hampton, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec323439495969757467574436
Data source: Temperature data for East Hampton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in East Hampton

In East Hampton in September, the total precipitation amount reaches 97 mm (3.8 in) over the course of 9 days.

September Precipitation Trends in East Hampton

The chart displays monthly precipitation patterns in East Hampton, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In East Hampton, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec69899312711292156999713092131
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in East Hampton

In East Hampton in September, humidity is 68%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket, making travel pleasant yet slightly muggy, which can be refreshing while exploring but may require occasional breaks to stay comfortable.

September Average Humidity in East Hampton

This chart illustrates the average monthly humidity levels in East Hampton, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in East Hampton is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in East Hampton

In East Hampton 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 East Hampton.

Maximum UV Index Levels in East Hampton for September

The chart shows the monthly maximum UV Index (UVI) for East Hampton in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in East Hampton typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: East Hampton September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in East Hampton Compares to Other Months

Weather in East Hampton varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in East Hampton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in East Hampton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)69 mm (2.7 inches)84%moderate
February Weather1°C (34°F)89 mm (3.5 inches)82%moderate
March Weather4°C (40°F)92 mm (3.6 inches)81%high
April Weather9°C (49°F)127 mm (5.0 inches)78%very high
May Weather15°C (59°F)112 mm (4.4 inches)69%very high
June Weather20°C (69°F)92 mm (3.6 inches)69%very high
July Weather24°C (75°F)156 mm (6.1 inches)62%very high
August Weather23°C (74°F)99 mm (3.9 inches)65%very high
September Weather19°C (67°F)97 mm (3.8 inches)68%very high
October Weather14°C (58°F)130 mm (5.1 inches)74%high
November Weather7°C (44°F)92 mm (3.6 inches)82%moderate
December Weather2°C (36°F)131 mm (5.1 inches)80%low

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