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September Weather in West Kennebunk, United States

Last updated: June 24, 2025

In September, the average temperature in West Kennebunk, United States is a pleasant 18°C (65°F), with a minimum dipping to 5°C (41°F) and a maximum reaching 32°C (90°F). Expect about 70 mm (2.8 in) of precipitation spread over 7 days, and enjoy an average humidity of around 71%. Stay prepared for a mix of warm days and refreshing showers!

September Temperature in West Kennebunk

In September in West Kennebunk, the average temperature is 18°C (65°F). The maximum can reach 32°C (90°F) and the minimum can be as low as 5°C (41°F). Be prepared for a range of temperatures, making it a great time for travelers to enjoy both warm days and cooler nights.

September Weather in West Kennebunk: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in West Kennebunk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In West Kennebunk, September typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (90°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec282935455566727164544132
Data source: Temperature data for West Kennebunk 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 West Kennebunk

In West Kennebunk in September, the precipitation amount is 70 mm (2.8 in) over a span of 7 days.

September Precipitation Trends in West Kennebunk

The chart displays monthly precipitation patterns in West Kennebunk, 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 West Kennebunk, September typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec81908112271701206570128107125
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in West Kennebunk

In West Kennebunk in September humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.

September Average Humidity in West Kennebunk

This chart illustrates the average monthly humidity levels in West Kennebunk, 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 West Kennebunk is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in West Kennebunk

In West Kennebunk 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 West Kennebunk.

Maximum UV Index Levels in West Kennebunk for September

The chart shows the monthly maximum UV Index (UVI) for West Kennebunk 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 West Kennebunk typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: West Kennebunk 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 West Kennebunk Compares to Other Months

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

This table compares monthly weather conditions in West Kennebunk, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)80 mm (3.2 inches)86%low
February Weather-2°C (29°F)90 mm (3.6 inches)84%moderate
March Weather2°C (35°F)81 mm (3.2 inches)82%moderate
April Weather7°C (46°F)122 mm (4.8 inches)80%high
May Weather13°C (56°F)71 mm (2.8 inches)72%very high
June Weather19°C (66°F)70 mm (2.8 inches)72%very high
July Weather22°C (72°F)120 mm (4.7 inches)67%very high
August Weather22°C (72°F)65 mm (2.5 inches)66%very high
September Weather18°C (65°F)70 mm (2.8 inches)71%high
October Weather12°C (54°F)128 mm (5.0 inches)78%moderate
November Weather5°C (42°F)107 mm (4.2 inches)84%moderate
December Weather0°C (33°F)125 mm (4.9 inches)81%low

Compare West Kennebunk's Climate with Cities Worldwide