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September Weather in Westport, United States

Last updated: June 24, 2025

In September, the average temperature in Westport, United States hovers around 16°C (62°F). Temperatures can range from a chilly 0°C (32°F) to a warm 33°C (91°F). This month typically sees 72 mm (2.8 in) of precipitation spread over 8 days, with average humidity levels at a comfortable 78%.

September Temperature in Westport

In September in Westport, the average temperature is 16°C (62°F). The maximum can reach 33°C (91°F), and the minimum can be as low as 0°C (32°F). This climate makes Westport an ideal destination for travelers looking for a mix of warm and cool temperatures during their visit.

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 16°C (62°F), with highs reaching up to 33°C (91°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec202330435665706961503627
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 precipitation amount is 72 mm (2.8 in) over the course of 8 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 72 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec767666107911141231157214210177
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 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
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 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 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
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 Weather-6°C (21°F)76 mm (3.0 inches)93%low
February Weather-5°C (23°F)76 mm (3.0 inches)92%moderate
March Weather-1°C (30°F)66 mm (2.6 inches)86%moderate
April Weather6°C (43°F)107 mm (4.2 inches)85%very high
May Weather13°C (56°F)91 mm (3.6 inches)80%very high
June Weather18°C (65°F)114 mm (4.5 inches)74%very high
July Weather21°C (71°F)123 mm (4.8 inches)76%very high
August Weather20°C (69°F)115 mm (4.5 inches)75%very high
September Weather16°C (62°F)72 mm (2.8 inches)78%high
October Weather10°C (50°F)142 mm (5.6 inches)86%moderate
November Weather2°C (36°F)101 mm (4.0 inches)88%moderate
December Weather-3°C (27°F)77 mm (3.0 inches)89%low

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