September weather forecastClarksville, TN
September
Weather in September
September predicts the awaited arrival of fall in Clarksville, with temperatures starting their gradual descent. The city witnesses a downturn in maximum temperatures from 86.5°F (30.3°C) in August to 81°F (27.2°C), signifying a change in weather conditions. Rainfall is also at the year's lowest, promising less wet days. Despite shorter days and declining sunshine hours, the city's vibrant fall foliage becomes a dominant sight, creating a colorful panorama. Clarksville's September weather provides the perfect backdrop for enjoying the picturesque fall season.Temperature
The arrival of September corresponds with a light shift in temperature, down from a tropical 86.5°F (30.3°C) in August to a warm 81°F (27.2°C). In September, the recorded average low-temperature in Clarksville is a comfortable 61.5°F (16.4°C).Heat index
In September, the average heat index is calculated to be a hot 86°F (30°C). Uninterrupted activity during exposure could lead to a sense of exhaustion, possibly causing heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
Humidity
In Clarksville, Tennessee, the average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall in Clarksville, Tennessee. Rain falls for 13.6 days and accumulates 1.93" (49mm) of precipitation.Snowfall
In Clarksville, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:17 pm. On the last day of September, sunrise is at 6:44 am and sunset at 6:33 pm CDT.
Sunshine
The average sunshine in September in Clarksville is 8.8h.UV index
In Clarksville, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Adopt protective measures - It is advised to guard against sun damage. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Clarksville, TN
- Average high temperature in September: 81°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (42.6°F).
- Average low temperature in September: 61.5°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).
Average pressure in September
Clarksville, TN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Clarksville, TN
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is February (8.7mph).
The calmest month (with the lowest average wind speed) is July (5.1mph).
Average humidity in September
Clarksville, TN
- Average humidity in September: 75%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Clarksville, TN
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is February (3.78").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in September
Clarksville, TN
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is July (18.4 days).
The month with the least rainy days is November (10.3 days).
Average snowfall in September
Clarksville, TN
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Clarksville, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Clarksville, TN
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Clarksville, TN
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is July (10.4 days).
Average UV index in September
Clarksville, TN
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Clarksville, TN
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in September
Clarksville, TN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
