September weather forecast
Knollwood, TN

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Weather in September

September, the first month of the autumn in Knollwood, is still a warm month, with an average temperature fluctuating between 81.5°F (27.5°C) and 60.6°F (15.9°C).

Temperature

In Knollwood, the average high-temperature in September slightly decreases from a tropical 87.4°F (30.8°C) in August to a warm 81.5°F (27.5°C). During September, Knollwood consistently records a temperature low averaging a refreshing 60.6°F (15.9°C).

Heat index

September's mean heat index is calculated to be a tropical 86°F (30°C). If activity and exposure persist, they could induce fatigue, leading to possible heat cramps.
The metrics for the heat index are tailored for both shady environments and light winds. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', takes into account both air temperature and humidity to illustrate what people actually feel. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.

Humidity

In Knollwood, the average relative humidity in September is 76%.

Rainfall

The month with the least rainfall in Knollwood is September, when the rain falls for 7.5 days and typically collects 0.43" (11mm) of precipitation.

Snowfall

In Knollwood, snow does not fall in April through November.

Daylight

In September, the average length of the day in Knollwood is 12h and 23min.
On the first day of September, sunrise is at 7:14 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:26 pm EDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, an average UV index of 5 transforms into the following instructions:
Prioritize safety - Recommendations to avert sunburn are shared. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September in Knollwood?

An average high-temperature, in September, in Knollwood, is 81.5°F (27.5°C) and the average low-temperature is 60.6°F (15.9°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 86°F (30°C).

What is the average humidity in September in Knollwood?

In Knollwood, the average relative humidity in September is 76%.

What is the driest month in Knollwood?

September is the month with the least rainfall in Knollwood. Rain falls for 7.5 days and accumulates 0.43" (11mm) of precipitation.

How many days does it rain in September in Knollwood?

In September, in Knollwood, Tennessee, the rain falls for 7.5 days. Throughout September, 0.43" (11mm) of precipitation is accumulated.

When it does not snow in Knollwood?

April through November are months without snowfall in Knollwood.

What is the average length of the day in September in Knollwood?

In September, the average day length in Knollwood is 12h and 23min.

When are sunrise and sunset in September in Knollwood?

In September, on the first day of the month, sunrise is at 7:14 am and sunset at 8:07 pm. On the last day of the month, in Knollwood, Tennessee, sunrise is at 7:35 am and sunset at 7:26 pm EDT.

How long on average sun shines in September in Knollwood?

In September, the average sunshine duration in Knollwood, Tennessee, is 8.5h.

What is the UV index intensity in September in Knollwood?

In Knollwood, Tennessee, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Knollwood, TN

Average temperature in September - Knollwood, TN
  • Average high temperature in September: 81.5°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (46°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (30.9°F).

Average pressure in September
Knollwood, TN

Average pressure in September - Knollwood, 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 (29.98"Hg).

Average wind speed in September
Knollwood, TN

Average wind speed in September - Knollwood, TN
  • Average wind speed in September: 4.1mph

The windiest month (with the highest average wind speed) is February (6.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity in September
Knollwood, TN

Average humidity in September - Knollwood, TN
  • Average humidity in September: 76%

The month with the highest relative humidity is December (80%).
The months with the lowest relative humidity are June, October and November (75%).

Average rainfall in September
Knollwood, TN

Average rainfall in September - Knollwood, TN
  • Average rainfall in September: 0.43"

The wettest months (with the highest rainfall) are February and December (1.18").
The driest month (with the least rainfall) is September (0.43").

Average rainfall days in September
Knollwood, TN

Average rainfall days in September - Knollwood, TN
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is July (11.7 days).
The month with the least rainy days is October (6.1 days).

Average snowfall in September
Knollwood, TN

Average snowfall in September - Knollwood, TN
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.31").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Knollwood, TN

Average snowfall days in September - Knollwood, TN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Knollwood, TN

Average daylight in September / Average sunshine in September - Knollwood, TN
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

Average sunshine days in September
Knollwood, TN

Average sunshine days in September - Knollwood, TN
  • Average sunshine days in September: 20.5 days

The month with the most sunshine days is October (23.6 days).
The month with the least sunshine days is July (16.8 days).

Average UV index in September
Knollwood, TN

Average UV index in September - Knollwood, 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
Knollwood, TN

Average cloud cover in September - Knollwood, TN
  • Average cloud cover in September: 32

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 30).

Average visibility in September
Knollwood, TN

Average visibility in September - Knollwood, TN
  • Average visibility in September: 5mi

The months with the highest visibility are June, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, July, August, September and December (5mi).

Knollwood, Tennessee, USA

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