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September Weather in Clarksville, United States

Last updated: June 24, 2025

In September, the average temperature in Clarksville, United States is a warm 26°C (78°F). However, temperatures can vary significantly, with lows dipping to 10°C (50°F) and soaring up to a sizzling 39°C (102°F). Expect about 80 mm (3.1 in) of precipitation spread over 9 days, while the average humidity remains comfortably high at 65%.

September Temperature in Clarksville

In September in Clarksville, the average temperature is 26°C (78°F). Maximums can reach 39°C (102°F), while minimums can drop as low as 10°C (50°F). Be prepared for a wide range of temperatures and pack accordingly for your travel to Clarksville.

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 26°C (78°F), with highs reaching up to 39°C (102°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec454858637280838378665450
Data source: Temperature data for Clarksville 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 Clarksville

In Clarksville in September, the precipitation amount is 80 mm (3.1 in) spread over 9 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 80 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9814313322017010471838014065112
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clarksville

In Clarksville in September, humidity is 65%. With an average temperature of 26°C (78°F), this humidity feels like a warm, muggy embrace that can make outdoor activities a bit challenging, often leaving travelers feeling sticky and in need of frequent breaks in the shade.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
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.
 TemperaturePrecipitationHumidityUV
January Weather7°C (46°F)98 mm (3.9 inches)80%moderate
February Weather9°C (48°F)143 mm (5.6 inches)79%high
March Weather15°C (58°F)133 mm (5.3 inches)78%very high
April Weather17°C (63°F)220 mm (8.7 inches)78%very high
May Weather22°C (73°F)170 mm (6.7 inches)81%extreme
June Weather26°C (80°F)104 mm (4.1 inches)78%extreme
July Weather28°C (83°F)71 mm (2.8 inches)73%extreme
August Weather28°C (83°F)83 mm (3.3 inches)66%extreme
September Weather26°C (78°F)80 mm (3.1 inches)65%very high
October Weather19°C (67°F)140 mm (5.5 inches)72%very high
November Weather12°C (55°F)65 mm (2.6 inches)82%high
December Weather10°C (50°F)112 mm (4.4 inches)87%moderate

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