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September Weather in Chatham, United States

Last updated: June 24, 2025

In September, the average temperature in Chatham, United States is a pleasant 22°C (71°F). However, temperatures can vary significantly, with a minimum of 5°C (42°F) and a maximum soaring to 35°C (94°F). Visitors should also expect 60 mm (2.4 in) of precipitation spread over 6 days, contributing to an average humidity of 79%.

September Temperature in Chatham

In September in Chatham, the average temperature is 22°C (71°F). The maximum can reach 35°C (94°F), while the minimum can drop as low as 5°C (42°F). This climate makes Chatham an ideal destination for travelers seeking warm days and cool evenings.

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

The chart illustrates September temperature patterns in Chatham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chatham, September typically has an average temperature of 22°C (71°F), with highs reaching up to 35°C (94°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec293244536575777471574236
Data source: Temperature data for Chatham 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 Chatham

In Chatham in September, the total precipitation amount is 60 mm (2.4 in) spread over 6 days.

September Precipitation Trends in Chatham

The chart displays monthly precipitation patterns in Chatham, 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 Chatham, September typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec686913613114412711088601026951
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chatham

In Chatham in September humidity is 79%. With an average temperature of 22°C (71°F), this humidity feels like a warm, sticky embrace that can make any outdoor adventure quite challenging for traveling; it's advisable to stay hydrated and take breaks in the shade to fully enjoy the sights.

September Average Humidity in Chatham

This chart illustrates the average monthly humidity levels in Chatham, 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 Chatham is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chatham

In Chatham 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 Chatham.

Maximum UV Index Levels in Chatham for September

The chart shows the monthly maximum UV Index (UVI) for Chatham 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 Chatham typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111198643
Data source: Chatham 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 Chatham Compares to Other Months

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

This table compares monthly weather conditions in Chatham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)68 mm (2.7 inches)84%moderate
February Weather0°C (32°F)69 mm (2.7 inches)82%moderate
March Weather6°C (44°F)136 mm (5.4 inches)84%high
April Weather11°C (53°F)130 mm (5.1 inches)83%very high
May Weather19°C (66°F)144 mm (5.7 inches)80%very high
June Weather24°C (75°F)126 mm (5.0 inches)83%extreme
July Weather25°C (78°F)110 mm (4.3 inches)82%extreme
August Weather24°C (75°F)87 mm (3.4 inches)82%very high
September Weather22°C (71°F)60 mm (2.4 inches)79%very high
October Weather14°C (58°F)102 mm (4.0 inches)79%high
November Weather5°C (42°F)69 mm (2.7 inches)88%moderate
December Weather2°C (36°F)50 mm (2.0 inches)87%moderate

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