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September Weather in Water Mill, United States

Last updated: June 24, 2025

In Water Mill, United States, the average temperature for September hovers around 20°C (69°F). Expect a minimum of 12°C (55°F) and a pleasant maximum of 26°C (79°F). During this month, the area sees about 99 mm (3.9 in) of precipitation spread over 10 days, contributing to an average humidity level of 75%. Enjoy your time in this beautiful climate!

September Temperature in Water Mill

In September in Water Mill, the average temperature is 20°C (69°F). Maximum temperatures can reach 26°C (79°F), while the minimum can drop to as low as 12°C (55°F). Overall, this pleasant climate makes Water Mill an ideal destination for travelers seeking comfortable weather.

September Weather in Water Mill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Water Mill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Water Mill, September typically has an average temperature of 20°C (69°F), with highs reaching up to 26°C (79°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec363739465464727368615042
Data source: Temperature data for Water Mill 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 Water Mill

In Water Mill in September, the total precipitation amount is 99 mm (3.9 in) spread over a period of 10 days.

September Precipitation Trends in Water Mill

The chart displays monthly precipitation patterns in Water Mill, 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 Water Mill, September typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec89123113137129729910399161113147
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Water Mill

In Water Mill in September, humidity is 75%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel a bit muggy and requiring frequent hydration breaks to stay comfortable while exploring.

September Average Humidity in Water Mill

This chart illustrates the average monthly humidity levels in Water Mill, 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 Water Mill is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Water Mill

In Water Mill 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 Water Mill.

Maximum UV Index Levels in Water Mill for September

The chart shows the monthly maximum UV Index (UVI) for Water Mill 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 Water Mill typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Water Mill 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 Water Mill Compares to Other Months

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

This table compares monthly weather conditions in Water Mill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)89 mm (3.5 inches)84%moderate
February Weather3°C (37°F)123 mm (4.8 inches)84%moderate
March Weather4°C (39°F)113 mm (4.5 inches)82%high
April Weather8°C (47°F)137 mm (5.4 inches)79%very high
May Weather12°C (54°F)129 mm (5.1 inches)75%very high
June Weather18°C (64°F)72 mm (2.9 inches)78%very high
July Weather22°C (72°F)99 mm (3.9 inches)76%very high
August Weather23°C (73°F)103 mm (4.0 inches)76%very high
September Weather20°C (69°F)99 mm (3.9 inches)75%very high
October Weather16°C (61°F)160 mm (6.3 inches)75%high
November Weather10°C (50°F)113 mm (4.4 inches)80%moderate
December Weather5°C (42°F)147 mm (5.8 inches)80%low

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