August weather forecast
Chattanooga, TN

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.