August weather forecast
Chattanooga, TN

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Panorama of the area of Chattanooga, Tennessee
Panorama of the area of Chattanooga, Tennessee

Weather in August

In Chattanooga, August continues with the established summer weather pattern. Despite slight dips in temperature compared to July, the city still experiences warm and sunny days. Despite the persistent summer heat, rainfall increases to reach 3.31" (84mm). As the month progresses towards September, the temperature begins to show signs of receding, preparing for the onset of autumn.

Temperature

As August takes its course, Chattanooga's average high-temperature registers at a still hot 87.3°F (30.7°C), closely aligning with the preceding month. Chattanooga records an average nighttime low of 66°F (18.9°C) in August.

Heat index

The average heat index in August is computed to be a torrid 100.4°F (38°C). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

June through August, October and November, with an average relative humidity of 75%, are the least humid months in Chattanooga.

Rainfall

In August, the rain falls for 17.6 days. Throughout August, 3.31" (84mm) of precipitation is accumulated. Throughout the year, in Chattanooga, there are 174.4 rainfall days, and 41.14" (1045mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Chattanooga.

Daylight

In Chattanooga, Tennessee, the average length of the day in August is 13h and 26min.
On the first day of August, sunrise is at 6:51 am and sunset at 8:43 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 8:08 pm EDT.

Sunshine

In Chattanooga, the average sunshine in August is 9.2h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Chattanooga. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 6 in August translates into these instructions:
Shield from overexposure. Defense against sun-related harm is required. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot in Chattanooga during August?

The average high-temperature and low-temperature in Chattanooga during August are 87.3°F (30.7°C) and 66°F (18.9°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is computed to be 100.4°F (38°C).

What is the least humid month in Chattanooga?

June through August, October and November, with an average relative humidity of 75%, are the least humid months.

What is the average humidity in August in Chattanooga?

The average relative humidity in August in Chattanooga is 75%.

How many days does it rain in August in Chattanooga?

In August, the rain falls for 17.6 days. Throughout August, 3.31" (84mm) of precipitation is accumulated.

When it does not snow in Chattanooga?

May through October are months without snowfall in Chattanooga, Tennessee.

How many hours of daylight does Chattanooga have in August?

The average day length in August is 13h and 26min.

What time are sunrise and sunset in August in Chattanooga?

In August, on the first day of the month, sunrise is at 6:51 am and sunset at 8:43 pm. On the last day of the month, in Chattanooga, Tennessee, sunrise is at 7:13 am and sunset at 8:08 pm EDT.

How many hours of sunshine does Chattanooga have in August?

In Chattanooga, the average sunshine duration in August is 9.2h.

What are the months with the highest UV index in Chattanooga?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Chattanooga.

What is the UV index reading in August in Chattanooga?

The average daily maximum UV index in August in Chattanooga, Tennessee, is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
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 August
Chattanooga, TN

Average temperature in August - Chattanooga, TN
  • Average high temperature in August: 87.3°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (46°F).

  • Average low temperature in August: 66°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (30.7°F).

Average pressure in August
Chattanooga, TN

Average pressure in August - Chattanooga, TN
  • Average pressure in August: 30"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 August
Chattanooga, TN

Average wind speed in August - Chattanooga, TN
  • Average wind speed in August: 3.8mph

The windiest month (with the highest average wind speed) is February (6.4mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity in August
Chattanooga, TN

Average humidity in August - Chattanooga, TN
  • Average humidity in August: 75%

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

Average rainfall in August
Chattanooga, TN

Average rainfall in August - Chattanooga, TN
  • Average rainfall in August: 3.31"

The wettest month (with the highest rainfall) is December (4.37").
The driest month (with the least rainfall) is September (2.56").

Average rainfall days in August
Chattanooga, TN

Average rainfall days in August - Chattanooga, TN
  • Average rainfall days in August: 17.6 days

The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (9.8 days).

Average snowfall in August
Chattanooga, TN

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

The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in August
Chattanooga, TN

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

The month with the highest number of snowfall days is January (4.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in August /
Average sunshine in August
Chattanooga, TN

Average daylight in August / Average sunshine in August - Chattanooga, TN
  • Average daylight in August: 13h 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 August: 9h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).

Average sunshine days in August
Chattanooga, TN

Average sunshine days in August - Chattanooga, TN
  • Average sunshine days in August: 12.3 days

The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is July (9.4 days).

Average UV index in August
Chattanooga, TN

Average UV index in August - Chattanooga, TN
  • Average UV index in August: 6

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 and December (UV index 2).

Average cloud cover in August
Chattanooga, TN

Average cloud cover in August - Chattanooga, TN
  • Average cloud cover in August: 33

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 31).

Average visibility in August
Chattanooga, TN

Average visibility in August - Chattanooga, TN
  • Average visibility in August: 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).

Chattanooga, Tennessee, USA

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