August weather forecast
Chattanooga, TN

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

Weather in August

August, the last month of the summer in Chattanooga, is another hot month, with an average temperature fluctuating between 87.3°F (30.7°C) and 66°F (18.9°C).

Temperature

In August, the average high-temperature is practically the same as in July - a still tropical 87.3°F (30.7°C). In August, the average low-temperature is 66°F (18.9°C).

Heat index

In August, the average heat index is appraised at a sweltering 100.4°F (38°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', 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 (clothing, wind, metabolic differences). 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 particularly important for children. 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

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

Rainfall

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

Snowfall

In Chattanooga, snow does not fall in May through October.

Daylight

The average length of the day in August is 13h and 26min.
On the first day of August, sunrise is at 6:50 am and sunset at 8:44 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 8:09 pm EDT.

Sunshine

In August, the average sunshine is 9.2h.

UV index

The months with the highest UV index in Chattanooga are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in August in Chattanooga?

In Chattanooga, in August, the average high-temperature is 87.3°F (30.7°C), and the average low-temperature is 66°F (18.9°C). in August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is appraised at 100.4°F (38°C).

What is the least humid month in Chattanooga?

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

What is the average humidity in August in Chattanooga?

In August, the average relative humidity in Chattanooga is 75%.

How many days does it rain in August in Chattanooga?

In Chattanooga, in August, during 17.6 rainfall days, 3.31" (84mm) of precipitation is typically 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?

In Chattanooga, Tennessee, 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 6:50 am and sunset at 8:44 pm. On the last day of the month, in Chattanooga, sunrise is at 7:13 am and sunset at 8:09 pm EDT.

How long on average sun shines in August in Chattanooga?

The average sunshine duration in August in Chattanooga, Tennessee, is 9.2h.

What is the month with the highest UV index in Chattanooga?

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

What is the UV index intensity in August in Chattanooga?

The average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 26min

The month with the longest days is June (Average daylight: 14h and 29min).
The month with the shortest days is December (Average daylight: 9h and 51min).

  • Average sunshine in August: 9h and 12min

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).

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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).

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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).

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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).

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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).

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