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September Weather in Port Leyden, United States

Last updated: June 24, 2025

In Port Leyden, United States, the average temperature in September hovers around 16°C (60°F). During this time, you might experience a minimum of -1°C (30°F) and a maximum of 31°C (87°F). Expect about 90 mm (3.5 in) of precipitation spread over 10 days, accompanied by an average humidity level of 78%.

September Temperature in Port Leyden

In September in Port Leyden, the average temperature is 16°C (60°F). Maximums can reach 31°C (87°F) and minimums can be as low as -1°C (30°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to ensure a comfortable visit.

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

The chart illustrates September temperature patterns in Port Leyden, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Leyden, September typically has an average temperature of 16°C (60°F), with highs reaching up to 31°C (87°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec202430435564696760503426
Data source: Temperature data for Port Leyden 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 Leyden

In Port Leyden in September, the precipitation amount is 90 mm (3.5 in) over the course of 10 days.

September Precipitation Trends in Port Leyden

The chart displays monthly precipitation patterns in Port Leyden, 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 Leyden, September typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec11612010413813412918514190184142137
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Port Leyden

In Port Leyden in September humidity is 78%. With an average temperature of 16°C (60°F), this humidity feels like a damp embrace, making travel a bit uncomfortable as the air clings to your skin and leaves you feeling sticky.

September Average Humidity in Port Leyden

This chart illustrates the average monthly humidity levels in Port Leyden, 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 Leyden is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Port Leyden

In Port Leyden 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 Port Leyden.

Maximum UV Index Levels in Port Leyden for September

The chart shows the monthly maximum UV Index (UVI) for Port Leyden 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 Leyden typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998632
Data source: Port Leyden 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 Leyden Compares to Other Months

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

This table compares monthly weather conditions in Port Leyden, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)116 mm (4.6 inches)90%moderate
February Weather-5°C (24°F)120 mm (4.7 inches)90%moderate
March Weather-1°C (30°F)104 mm (4.1 inches)87%high
April Weather6°C (43°F)138 mm (5.4 inches)88%very high
May Weather13°C (56°F)134 mm (5.3 inches)82%very high
June Weather18°C (64°F)129 mm (5.1 inches)79%very high
July Weather21°C (69°F)185 mm (7.3 inches)78%very high
August Weather19°C (67°F)141 mm (5.5 inches)76%very high
September Weather16°C (60°F)90 mm (3.5 inches)78%very high
October Weather10°C (50°F)184 mm (7.3 inches)84%high
November Weather1°C (35°F)141 mm (5.6 inches)89%moderate
December Weather-3°C (26°F)137 mm (5.4 inches)86%low

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