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September Weather in Port Washington, United States

Last updated: June 24, 2025

In Port Washington, United States, the average temperature in September hovers around 18°C (65°F). However, be prepared for temperature fluctuations, as it can dip to a crisp 5°C (41°F) or soar to a warm 29°C (85°F). Expect about 91 mm (3.6 in) of precipitation spread over 10 days, accompanied by a relatively high average humidity of 79%. Whether you're planning for a sunny day or a rainy one, it's wise to be prepared!

September Temperature in Port Washington

In September in Port Washington, the average temperature is 18°C (65°F). Maximums can reach 29°C (85°F), and minimums can drop as low as 5°C (41°F). This range makes Port Washington a comfortable destination for travelers, offering pleasant conditions for outdoor activities.

September Weather in Port Washington: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Port Washington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Washington, September typically has an average temperature of 18°C (65°F), with highs reaching up to 29°C (85°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec232434425364717064523730
Data source: Temperature data for Port Washington 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 Port Washington

In Port Washington in September, the precipitation amount totals 91 mm (3.6 in) over a span of 10 days.

September Precipitation Trends in Port Washington

The chart displays monthly precipitation patterns in Port Washington, 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 Port Washington, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec5554641081251039480911185052
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Port Washington

In Port Washington in September, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

September Average Humidity in Port Washington

This chart illustrates the average monthly humidity levels in Port Washington, 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 Port Washington is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Port Washington

In Port Washington in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Port Washington.

Maximum UV Index Levels in Port Washington for September

The chart shows the monthly maximum UV Index (UVI) for Port Washington 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 Port Washington typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Port Washington 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 Port Washington Compares to Other Months

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

This table compares monthly weather conditions in Port Washington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)55 mm (2.2 inches)85%low
February Weather-4°C (24°F)54 mm (2.1 inches)85%moderate
March Weather1°C (35°F)64 mm (2.5 inches)85%moderate
April Weather6°C (43°F)108 mm (4.3 inches)85%very high
May Weather12°C (53°F)125 mm (4.9 inches)78%very high
June Weather18°C (64°F)103 mm (4.0 inches)80%very high
July Weather22°C (71°F)94 mm (3.7 inches)78%very high
August Weather21°C (70°F)80 mm (3.2 inches)76%very high
September Weather18°C (65°F)91 mm (3.6 inches)79%high
October Weather11°C (52°F)118 mm (4.6 inches)83%moderate
November Weather3°C (38°F)50 mm (2.0 inches)88%moderate
December Weather-1°C (31°F)52 mm (2.0 inches)81%low

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