Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September witnesses a gentle descent in average high-temperature, descending from August's hot 87.8°F (31°C) to a moderately hot 81.7°F (27.6°C). Throughout September, the nighttime temperature in Clarksville averages to an enjoyable 62.4°F (16.9°C).Heat index
September's heat index is calculated to be a tropical 86°F (30°C). If one continues to be active during enduring exposure, it could result in fatigue and heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', reflects the feeling of heat when considering both air temperature and humidity. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
Humidity
In Clarksville, the average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall. Rain falls for 12.3 days and accumulates 1.85" (47mm) of precipitation.Snowfall
May through October are months without snowfall in Clarksville.Daylight
In Clarksville, the average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:42 pm. On the last day of September, in Clarksville, sunrise is at 7:09 am and sunset at 6:58 pm EDT.
Sunshine
The average sunshine in September in Clarksville, Virginia, is 8.6h.UV index
The average daily maximum UV index in September in Clarksville is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum UV index of 5 in September translates into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Clarksville in September?
What is the average humidity in September in Clarksville?
What is the driest month in Clarksville?
How much does it rain in Clarksville in September?
When it does not snow in Clarksville?
How many hours of daylight does Clarksville have in September?
What time are sunrise and sunset in September in Clarksville?
How long on average sun shines in September in Clarksville?
How high is the UV index in September in Clarksville?
Average temperature in September
Clarksville, VA
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (46°F).
- Average low temperature in September: 62.4°F
The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in September
Clarksville, VA
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Clarksville, VA
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Clarksville, VA
- Average humidity in September: 75%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Clarksville, VA
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in September
Clarksville, VA
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (9.5 days).
Average snowfall in September
Clarksville, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Clarksville, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Clarksville, VA
- Average daylight in September: 12h and 2min
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 4min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Clarksville, VA
- Average sunshine days in September: 16 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in September
Clarksville, VA
- 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, VA
- Average cloud cover in September: 40
The month with the most cloud cover is March (Cloud cover 44).
The months with the least cloud cover are June and July (Cloud cover 32).
Average visibility in September
Clarksville, VA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Clarksville, Virginia, USA
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