September Weather in Clarksville, United States

Last updated: June 24, 2025

In September, the average temperature in Clarksville, United States hovers around 19°C (66°F). Expect minimums of 2°C (36°F) and maximums reaching up to 33°C (92°F). While you enjoy the pleasant weather, keep an umbrella handy, as the region sees an average precipitation of 109 mm (4.3 in) over approximately 10 days, coupled with a comfortable average humidity of 75%.

September Temperature in Clarksville

In September in Clarksville, the average temperature is 19°C (66°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 2°C (36°F). This diverse climate makes Clarksville an ideal destination for travelers looking to experience a range of temperatures and activities.

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

The chart illustrates September temperature patterns in Clarksville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clarksville, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Clarksville

In Clarksville in September, the precipitation amount is 109 mm (4.3 in) spread over 10 days.

September Precipitation Trends in Clarksville

The chart displays monthly precipitation patterns in Clarksville, 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 Clarksville, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Clarksville

In Clarksville 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 Clarksville

This chart illustrates the average monthly humidity levels in Clarksville, 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 Clarksville is approximately 75%, 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 Clarksville

In Clarksville 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 Clarksville.

Maximum UV Index Levels in Clarksville for September

The chart shows the monthly maximum UV Index (UVI) for Clarksville 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 Clarksville typically reaches 8, which falls under the very high exposure category.

Data source: Clarksville 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 Clarksville Compares to Other Months

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

This table compares monthly weather conditions in Clarksville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	39 mm (1.5 inches)	82%	moderate
February Weather	-7°C (20°F)	48 mm (1.9 inches)	84%	moderate
March Weather	2°C (36°F)	72 mm (2.8 inches)	80%	moderate
April Weather	8°C (47°F)	77 mm (3.0 inches)	81%	very high
May Weather	16°C (61°F)	155 mm (6.1 inches)	74%	very high
June Weather	22°C (73°F)	118 mm (4.7 inches)	80%	extreme
July Weather	24°C (75°F)	96 mm (3.8 inches)	80%	very high
August Weather	22°C (71°F)	112 mm (4.4 inches)	77%	very high
September Weather	19°C (66°F)	109 mm (4.3 inches)	75%	very high
October Weather	10°C (51°F)	129 mm (5.1 inches)	80%	moderate
November Weather	2°C (36°F)	47 mm (1.9 inches)	87%	moderate
December Weather	-2°C (29°F)	35 mm (1.4 inches)	83%	moderate