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September Weather in East Harwich, United States

Last updated: June 24, 2025

The average temperature in East Harwich, United States during September is a pleasant 19°C (66°F). You can expect a minimum of 13°C (56°F) and a maximum of 24°C (75°F) throughout the month. Be prepared for some rain, as the area receives about 116 mm (4.6 in) of precipitation over 10 days. With an average humidity of 75%, it's advisable to embrace the refreshing atmosphere!

September Temperature in East Harwich

In September in East Harwich, the average temperature is 19°C (66°F), with maximums reaching 24°C (75°F) and minimums dipping as low as 13°C (56°F). This pleasant climate makes it an ideal time for outdoor activities and exploration.

September Weather in East Harwich: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in East Harwich, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In East Harwich, September typically has an average temperature of 19°C (66°F), with highs reaching up to 24°C (75°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec363638455261697066594840
Data source: Temperature data for East Harwich 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 East Harwich

In East Harwich in September, the total precipitation amount is 116 mm (4.6 in) over a span of 10 days.

September Precipitation Trends in East Harwich

The chart displays monthly precipitation patterns in East Harwich, 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 East Harwich, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec95124119131121887783116169106138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in East Harwich

In East Harwich in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.

September Average Humidity in East Harwich

This chart illustrates the average monthly humidity levels in East Harwich, 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 East Harwich is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in East Harwich

In East Harwich 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 East Harwich.

Maximum UV Index Levels in East Harwich for September

The chart shows the monthly maximum UV Index (UVI) for East Harwich 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 East Harwich typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: East Harwich 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 East Harwich Compares to Other Months

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

This table compares monthly weather conditions in East Harwich, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)94 mm (3.7 inches)84%moderate
February Weather2°C (37°F)124 mm (4.9 inches)84%moderate
March Weather3°C (38°F)119 mm (4.7 inches)82%high
April Weather7°C (45°F)131 mm (5.1 inches)79%very high
May Weather11°C (52°F)121 mm (4.8 inches)75%very high
June Weather16°C (61°F)88 mm (3.5 inches)78%very high
July Weather20°C (69°F)77 mm (3.0 inches)76%very high
August Weather21°C (71°F)83 mm (3.3 inches)76%very high
September Weather19°C (66°F)116 mm (4.6 inches)75%very high
October Weather15°C (59°F)169 mm (6.7 inches)75%high
November Weather9°C (49°F)106 mm (4.2 inches)80%moderate
December Weather5°C (41°F)138 mm (5.4 inches)80%low

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