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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 warm 26°C (79°F). Expect temperatures to range from a cool 12°C (53°F) to a sizzling 40°C (104°F). This month, 90 mm (3.5 in) of precipitation is anticipated over 8 days, accompanied by an average humidity of 63%. Prepare for a season that blends warmth with the occasional drizzle!

September Temperature in Chatham

In September in Chatham, the average temperature is 26°C (79°F). Maximums can reach 40°C (104°F) and minimums can be as low as 12°C (53°F). Be prepared for warm days and cooler evenings when traveling during this time.

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 26°C (79°F), with highs reaching up to 40°C (104°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec495261657480838279685652
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 precipitation amount is 90 mm (3.5 in) spread over 8 days, indicating a relatively wet period for the region.

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 90 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec110180125160138122971269011581128
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 63%. With average temperature 26°C (79°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls or exploring local attractions, though be prepared for a slight stickiness that may prompt you to seek shade or refreshing beverages along the way.

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 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%78%79%81%77%72%65%63%70%82%88%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111112121110864
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 Weather9°C (49°F)110 mm (4.3 inches)82%moderate
February Weather11°C (53°F)180 mm (7.1 inches)80%high
March Weather16°C (62°F)125 mm (4.9 inches)78%very high
April Weather18°C (65°F)160 mm (6.3 inches)79%extreme
May Weather24°C (75°F)138 mm (5.4 inches)81%extreme
June Weather27°C (80°F)122 mm (4.8 inches)77%extreme
July Weather28°C (83°F)97 mm (3.8 inches)72%extreme
August Weather28°C (83°F)125 mm (4.9 inches)65%extreme
September Weather26°C (79°F)90 mm (3.5 inches)63%very high
October Weather20°C (69°F)115 mm (4.5 inches)70%very high
November Weather13°C (56°F)81 mm (3.2 inches)82%high
December Weather11°C (53°F)128 mm (5.0 inches)88%moderate

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