September weather forecast
Karns, TN

Share

Weather in September

September, the first month of the autumn in Karns, is still a warm month, with an average temperature ranging between min 59.9°F (15.5°C) and max 82.2°F (27.9°C).

Temperature

With September's onset, the weather reveals a slight temperature decrease, transitioning from a hot 88.2°F (31.2°C) in August to a moderately hot 82.2°F (27.9°C). A sharp divergence from daytime highs is noted during the month of September, with the average nighttime temperature settling at a mild 59.9°F (15.5°C).

Heat index

The heat index value during September is computed to be a hot 87.8°F (31°C). Ongoing exposure and activity could lead to a state of exhaustion, with a chance of heat cramps.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in September is 72%.

Rainfall

The month with the least rainfall is September, when the rain falls for 11.3 days and typically collects 1.5" (38mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Karns, the average length of the day in September is 12h and 23min.
On the first day of the month, sunrise is at 7:08 am and sunset at 8:03 pm. On the last day of September, sunrise is at 7:31 am and sunset at 7:21 pm EDT.

Sunshine

The average sunshine in September in Karns is 8.6h.

UV index

In Karns, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the maximum UV index of 5 suggests this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Updated: Jul 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature during September is 82.2°F (27.9°C) and the low-temperature is 59.9°F (15.5°C). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is computed to be 87.8°F (31°C).

What is the average humidity in September?

The average relative humidity in September is 72%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 11.3 days and accumulates 1.5" (38mm) of precipitation.

How much does it rain in September?

In Karns, in September, during 11.3 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

When it does not snow in Karns?

May through October are months without snowfall.

What is the average length of the day in September?

The average day length in September is 12h and 23min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 7:08 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:21 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.6h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe 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
Karns, TN

Average temperature in September - Karns, TN
  • Average high temperature in September: 82.2°F

The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is January (44.8°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).

Average pressure in September
Karns, TN

Average pressure in September - Karns, TN
  • Average pressure in September: 30.04"Hg

The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

Average wind speed in September
Karns, TN

Average wind speed in September - Karns, TN
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity in September
Karns, TN

Average humidity in September - Karns, TN
  • Average humidity in September: 72%

The months with the highest relative humidity are February and December (78%).
The month with the lowest relative humidity is August (70%).

Average rainfall in September
Karns, TN

Average rainfall in September - Karns, TN
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is February (3.66").
The driest month (with the least rainfall) is September (1.5").

Average rainfall days in September
Karns, TN

Average rainfall days in September - Karns, TN
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is November (8.4 days).

Average snowfall in September
Karns, TN

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

The month with the highest snowfall is February (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Karns, TN

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

The month with the highest number of snowfall days is January (3.8 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
Karns, TN

Average daylight in September / Average sunshine in September - Karns, TN
  • 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 48min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in September
Karns, TN

Average sunshine days in September - Karns, TN
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (12.9 days).

Average UV index in September
Karns, TN

Average UV index in September - Karns, 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
Karns, TN

Average cloud cover in September - Karns, TN
  • Average cloud cover in September: 30

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in September
Karns, TN

Average visibility in September - Karns, TN
  • Average visibility in September: 6mi

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

Karns, Tennessee, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location