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
Welcoming September, Knoxville notes an average high-temperature of a moderately hot 85.3°F (29.6°C), nearly consistent with August's 89.6°F (32°C). Knoxville sees an average low-temperature of 67.8°F (19.9°C) during September.Heat index
Throughout September, the heat index is calculated to be a very hot 95°F (35°C). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.
Humidity
In September, the average relative humidity in Knoxville is 73%.Rainfall
September is the month with the least rainfall. Rain falls for 10 days and accumulates 0.71" (18mm) of precipitation.Snowfall
January, March through December are months without snowfall.Daylight
The average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 7:11 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:21 pm EDT.
Sunshine
In September, the average sunshine in Knoxville is 8.6h.UV index
In Knoxville, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 6 in September translates into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Frequently asked questions
How hot is it in Knoxville in September?
What is the average humidity in September in Knoxville?
What is the driest month in Knoxville?
How many days does it rain in September in Knoxville?
When it does not snow in Knoxville?
What is the average length of the day in September in Knoxville?
When are sunrise and sunset in September in Knoxville?
How long on average sun shines in September in Knoxville?
What is the UV index reading in September in Knoxville?
Average temperature in September
Knoxville, GA
- Average high temperature in September: 85.3°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (55°F).
- Average low temperature in September: 67.8°F
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in September
Knoxville, GA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Knoxville, GA
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is February (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Knoxville, GA
- Average humidity in September: 73%
The month with the highest relative humidity is December (75%).
The months with the lowest relative humidity are January, October and November (70%).
Average rainfall in September
Knoxville, GA
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is August (1.77").
The driest month (with the least rainfall) is September (0.71").
Average rainfall days in September
Knoxville, GA
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is August (17.2 days).
The month with the least rainy days is November (5.5 days).
Average snowfall in September
Knoxville, GA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Knoxville, GA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Knoxville, GA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in September
Knoxville, GA
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is October (23.3 days).
The month with the least sunshine days is August (10.6 days).
Average UV index in September
Knoxville, GA
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Knoxville, GA
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 43).
The month with the least cloud cover is October (Cloud cover 28).
Average visibility in September
Knoxville, GA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Knoxville, Georgia, USA
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