Chattanooga
Tennessee, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Chattanooga, TN

A stunning aerial panorama of the area of Chattanooga, Tennessee, a distant white skyline in the horizon and mountains
A stunning aerial panorama of the area of Chattanooga, Tennessee, a distant white skyline in the horizon and mountains
The first month of the autumn, Septiembre, is also a moderately hot month in Chattanooga, Tennessee, with temperature in the range of an average high of 83.1°F (28.4°C) and an average low of 61.9°F (16.6°C).

Temperature

In Chattanooga, the average high-temperature in Septiembre marginally drops, from a tropical 89.6°F (32°C) in Agosto, to a warm 83.1°F (28.4°C). In Septiembre, in Chattanooga, Tennessee, the average low-temperature is 61.9°F (16.6°C).

Heat index

The average heat index is estimated at a tropical 90.7°F (32.6°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, pregnancy, clothing). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

With an average relative humidity of 77%, Septiembre is the most humid month in Chattanooga.

Rainfall

In Septiembre, the rain falls for 8 days. Throughout Septiembre, 4.04" (102.6mm) of precipitation is accumulated. In Chattanooga, during the entire year, the rain falls for 119.6 days and collects up to 52.48" (1332.9mm) of precipitation.

Snowfall

In Chattanooga snow does not fall in Mayo through Noviembre.

Daylight

In Septiembre, the average length of the day in Chattanooga is 12.4h.

Sunshine

The average sunshine is 7.6h.

UV index

In Septiembre, the average daily maximum UV index in Chattanooga is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 8 in Septiembre transform into the following instructions:
Take extra precautions. Protection against sun damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in Septiembre in Chattanooga?

In Chattanooga, Tennessee, in Septiembre, the average high-temperature is 83.1°F (28.4°C), and the average low-temperature is 61.9°F (16.6°C). In Septiembre, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that takes the relative humidity and factores it into the air temperature reading, is evaluated at 90.7°F (32.6°C).

What is the most humid month in Chattanooga?

The most humid month is Septiembre, with an average relative humidity of 77%.

What is the average humidity in Septiembre in Chattanooga?

In Chattanooga, Tennessee, the average relative humidity in Septiembre is 77%.

How many days does it rain in Septiembre in Chattanooga?

In Chattanooga, Tennessee, during Septiembre, the rain falls for 8 days and regularly aggregates up to 4.04" (102.6mm) of precipitation.

When it does not snow in Chattanooga?

Mayo through Noviembre are months without snowfall in Chattanooga, Tennessee.

What is the average length of the day in Septiembre in Chattanooga?

The average length of the day in Septiembre is 12.4h.

How long on average sun shines in Septiembre in Chattanooga?

In Septiembre, the average sunshine in Chattanooga, Tennessee, is 7.6h.

How high is the UV index in Septiembre in Chattanooga?

In Chattanooga, the average daily maximum UV index in Septiembre is 8. A UV Index reading of 8 to 10 represents a very high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Chattanooga, TN
  • Average high temperature in September: 83.2°F

The warmest month (with the highest average high temperature) is July (90.2°F).
The month with the lowest average high temperature is January (50.2°F).

  • Average low temperature in September: 61.8°F

The month with the highest average low temperature is July (69.7°F).
The coldest month (with the lowest average low temperature) is January (30.7°F).

Average humidity in September - Chattanooga, TN
  • Average humidity in September: 77%

The month with the highest relative humidity is September (77%).
The month with the lowest relative humidity is April (63.8%).

Average rainfall in September - Chattanooga, TN
  • Average rainfall in September: 4"

Wettest months (with the highest rainfall) are March and November (5").
The driest month (with the lowest rainfall) is October (3.3").

Average rainfall days in September - Chattanooga, TN
  • Average rainfall days in September: 8 days

The month with the highest number of rainy days is July (11.7 days).
The month with the lowest number of rainy days is October (7.7 days).

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

The month with the highest snowfall is January (1.7").
Months with the lowest snowfall are May, June, July, August, September, October and November (0").

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

The month with the highest number of snowfall days is January (1 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Chattanooga, TN
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 7.6h

The month with most sunshine is June (Average sunshine: 9.2h).
The month with least sunshine is December (Average sunshine: 4.5h).

Average UV index in September - Chattanooga, TN
  • Average UV index in September: 8

Months with the highest UV index are June and July (UV index 10).
The month with the lowest UV index is December (UV index 2).