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September Weather in Westport, United States

Last updated: June 24, 2025

In Westport, United States, the average temperature in September hovers around 21°C (70°F). Expect a minimum of 6°C (43°F) and a maximum of 33°C (92°F) throughout the month. With 83 mm (3.3 in) of precipitation spread over 7 days, don't forget your umbrella! The average humidity level stands at a comfortable 69%, making it a pleasant time to experience the local atmosphere.

September Temperature in Westport

In September in Westport, the average temperature is 21°C (70°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 6°C (43°F). This weather makes Westport an ideal destination for travelers seeking pleasant temperatures and a variety of outdoor activities.

September Weather in Westport: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Westport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westport, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec323544536573777470584337
Data source: Temperature data for Westport 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 Westport

In Westport in September, the total precipitation amount is 83 mm (3.3 in) over the course of 7 days.

September Precipitation Trends in Westport

The chart displays monthly precipitation patterns in Westport, 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 Westport, September typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec86116140122131128109948399104106
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Westport

In Westport in September humidity is 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

September Average Humidity in Westport

This chart illustrates the average monthly humidity levels in Westport, 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 Westport is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Westport

In Westport 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 Westport.

Maximum UV Index Levels in Westport for September

The chart shows the monthly maximum UV Index (UVI) for Westport 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 Westport typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Westport 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 Westport Compares to Other Months

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

This table compares monthly weather conditions in Westport, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)86 mm (3.4 inches)87%moderate
February Weather2°C (36°F)116 mm (4.6 inches)85%moderate
March Weather7°C (44°F)140 mm (5.5 inches)86%high
April Weather12°C (53°F)122 mm (4.8 inches)84%very high
May Weather18°C (65°F)131 mm (5.2 inches)79%very high
June Weather23°C (73°F)128 mm (5.0 inches)82%extreme
July Weather25°C (77°F)109 mm (4.3 inches)79%very high
August Weather23°C (74°F)93 mm (3.7 inches)70%very high
September Weather21°C (70°F)83 mm (3.3 inches)69%very high
October Weather15°C (59°F)99 mm (3.9 inches)76%high
November Weather6°C (43°F)104 mm (4.1 inches)88%moderate
December Weather3°C (38°F)106 mm (4.2 inches)87%moderate

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