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September Weather in Chilmark, United States

Last updated: June 24, 2025

In September, the average temperature in Chilmark, United States hovers around 19°C (67°F). Expect a comfortable range with minimum temperatures dipping to 14°C (57°F) and maximums climbing to 24°C (75°F). However, be prepared for some rain, as precipitation can reach up to 111 mm (4.4 in) over approximately 10 days. With an average humidity of 75%, it's a great time to enjoy the lush surroundings!

September Temperature in Chilmark

In September in Chilmark, the average temperature is 19°C (67°F). Maximums can reach 24°C (75°F), and minimums can be as low as 14°C (57°F). This pleasant climate makes Chilmark a great destination for travelers looking to enjoy mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in Chilmark, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chilmark, September typically has an average temperature of 19°C (67°F), with highs reaching up to 24°C (75°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec373738455262707167605042
Data source: Temperature data for Chilmark 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 Chilmark

In Chilmark in September, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.

September Precipitation Trends in Chilmark

The chart displays monthly precipitation patterns in Chilmark, 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 Chilmark, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec95118117128123887590111171105130
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chilmark

In Chilmark in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

September Average Humidity in Chilmark

This chart illustrates the average monthly humidity levels in Chilmark, 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 Chilmark 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 Chilmark

In Chilmark 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 Chilmark.

Maximum UV Index Levels in Chilmark for September

The chart shows the monthly maximum UV Index (UVI) for Chilmark 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 Chilmark typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Chilmark 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 Chilmark Compares to Other Months

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

This table compares monthly weather conditions in Chilmark, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)95 mm (3.7 inches)84%moderate
February Weather3°C (37°F)118 mm (4.6 inches)84%moderate
March Weather4°C (39°F)117 mm (4.6 inches)82%high
April Weather7°C (46°F)128 mm (5.0 inches)79%very high
May Weather11°C (53°F)123 mm (4.8 inches)75%very high
June Weather16°C (62°F)88 mm (3.4 inches)78%very high
July Weather21°C (70°F)75 mm (3.0 inches)76%very high
August Weather22°C (72°F)90 mm (3.6 inches)76%very high
September Weather19°C (67°F)111 mm (4.4 inches)75%very high
October Weather16°C (61°F)170 mm (6.7 inches)75%high
November Weather10°C (50°F)105 mm (4.1 inches)80%moderate
December Weather5°C (42°F)130 mm (5.1 inches)80%low

Compare Chilmark's Climate with Cities Worldwide