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September Weather in Clarksville, United States

Last updated: June 24, 2025

In Clarksville, United States, the average temperature in September hovers around 21°C (70°F). However, it can range from a refreshing 6°C (43°F) to a sweltering 34°C (93°F). During this month, you can expect about 78 mm (3.1 in) of precipitation spread over 8 days, accompanied by a average humidity of 73%. Make sure to prepare for fluctuating conditions while enjoying your time!

September Temperature in Clarksville

In September in Clarksville, the average temperature is 21°C (70°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 6°C (43°F). This makes it a great time to explore the area, as you can enjoy warm days and cool evenings.

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 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec323644536573777470584337
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 total precipitation amount is 78 mm (3.1 in) over the course of 8 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 78 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec8010612511512212611980789499107
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 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%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 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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
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 Weather0°C (32°F)80 mm (3.2 inches)88%moderate
February Weather2°C (36°F)106 mm (4.2 inches)88%moderate
March Weather6°C (44°F)125 mm (4.9 inches)87%high
April Weather12°C (53°F)115 mm (4.5 inches)85%very high
May Weather18°C (65°F)122 mm (4.8 inches)81%very high
June Weather23°C (73°F)126 mm (5.0 inches)82%very high
July Weather25°C (77°F)119 mm (4.7 inches)81%very high
August Weather23°C (74°F)80 mm (3.1 inches)73%very high
September Weather21°C (70°F)78 mm (3.1 inches)73%very high
October Weather15°C (59°F)94 mm (3.7 inches)78%high
November Weather6°C (43°F)99 mm (3.9 inches)89%moderate
December Weather3°C (38°F)107 mm (4.2 inches)87%moderate

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