September Weather in Chatham, Canada

Last updated: June 18, 2025

In September, the average temperature in Chatham, Canada hovers around 19°C (66°F). Expect a minimum of 4°C (39°F) and a maximum of 32°C (90°F). During this month, precipitation amounts to 76 mm (3.0 in) over approximately 10 days, accompanied by an average humidity level of 81%.

September Temperature in Chatham

In September in Chatham, the average temperature is 19°C (66°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop to as low as 4°C (39°F). This varied climate makes Chatham an ideal destination for travelers looking to experience a range of weather conditions.

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 19°C (66°F), with highs reaching up to 32°C (90°F) and lows dropping to around 4°C (39°F).

Data source: Temperature data for Chatham generated using information from the Copernicus Climate Change Service.

September Precipitation in Chatham

In Chatham in September, the total precipitation amount is 76 mm (3.0 in) spread over a period of 10 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 76 mm (3.0 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Chatham

In Chatham in September, humidity is 81%. With an average temperature of 19°C (66°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel both muggy and slightly stifling, often leading to a need for frequent breaks in the shade.

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 81%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (28°F)	67 mm (2.6 inches)	90%	low
February Weather	-2°C (29°F)	69 mm (2.7 inches)	90%	moderate
March Weather	2°C (36°F)	71 mm (2.8 inches)	87%	moderate
April Weather	8°C (46°F)	96 mm (3.8 inches)	87%	very high
May Weather	14°C (58°F)	104 mm (4.1 inches)	82%	very high
June Weather	21°C (69°F)	96 mm (3.8 inches)	81%	very high
July Weather	23°C (74°F)	95 mm (3.8 inches)	79%	very high
August Weather	22°C (73°F)	83 mm (3.2 inches)	80%	very high
September Weather	19°C (66°F)	76 mm (3.0 inches)	81%	very high
October Weather	13°C (55°F)	108 mm (4.2 inches)	84%	high
November Weather	5°C (40°F)	80 mm (3.2 inches)	88%	moderate
December Weather	1°C (33°F)	64 mm (2.5 inches)	87%	low