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September Weather in Harpswell Center, United States

Last updated: June 24, 2025

In Harpswell Center, United States, the average temperature in September hovers around 17°C (63°F), offering a pleasant climate for outdoor activities. However, be prepared for temperature fluctuations, with lows of 9°C (48°F) and highs reaching 25°C (77°F). Rain is a possibility, with an average precipitation of 81 mm (3.2 in) spread over 8 days, so don’t forget your umbrella! Additionally, enjoy the average humidity level of 71%, which adds a hint of freshness to the air.

September Temperature in Harpswell Center

In September in Harpswell Center, the average temperature is 17°C (63°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop to as low as 9°C (48°F). This mild climate makes Harpswell Center an ideal destination for enjoyable outdoor activities and sightseeing.

September Weather in Harpswell Center: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Harpswell Center, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harpswell Center, September typically has an average temperature of 17°C (63°F), with highs reaching up to 25°C (77°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec293034435160676863544334
Data source: Temperature data for Harpswell Center 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 Harpswell Center

In Harpswell Center in September, the precipitation amount is 81 mm (3.2 in) over the course of 8 days.

September Precipitation Trends in Harpswell Center

The chart displays monthly precipitation patterns in Harpswell Center, 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 Harpswell Center, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1011059215495771127381170134149
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harpswell Center

In Harpswell Center in September, humidity is 71%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet a bit sticky, so travelers should stay hydrated and take breaks in the shade.

September Average Humidity in Harpswell Center

This chart illustrates the average monthly humidity levels in Harpswell Center, 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 Harpswell Center 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 Harpswell Center

In Harpswell Center 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 Harpswell Center.

Maximum UV Index Levels in Harpswell Center for September

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

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

This table compares monthly weather conditions in Harpswell Center, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (30°F)101 mm (4.0 inches)86%low
February Weather-1°C (31°F)104 mm (4.1 inches)84%moderate
March Weather1°C (34°F)92 mm (3.6 inches)82%moderate
April Weather6°C (43°F)154 mm (6.1 inches)80%high
May Weather11°C (51°F)95 mm (3.8 inches)72%very high
June Weather16°C (60°F)77 mm (3.0 inches)72%very high
July Weather19°C (67°F)112 mm (4.4 inches)67%very high
August Weather20°C (68°F)73 mm (2.9 inches)66%very high
September Weather17°C (63°F)81 mm (3.2 inches)71%high
October Weather12°C (55°F)170 mm (6.7 inches)78%moderate
November Weather6°C (43°F)134 mm (5.3 inches)84%moderate
December Weather1°C (34°F)149 mm (5.9 inches)81%low

Compare Harpswell Center's Climate with Cities Worldwide