August weather forecast
Shelbyville, TN

Harboring the tail-end of summer, August in Shelbyville sees the continuation of warm temperatures, although a slight drop indicates the progressive approach of fall. The number of daylight hours starts to decrease gradually, hinting at the seasonal shift to come. Notably, the temperature doesn't differ much from July, with August heat reaching up to 86.5°F (30.3°C). Life continues in full swing under the extended daylight, with residents eager to make the most of the last summer days.

Temperature

The advent of August signifies a minor shift to an average high-temperature of a still hot 86.5°F (30.3°C), aligning closely with July. The nighttime temperature dips to a comfortable 67.1°F (19.5°C) on average during August.

Heat index

August's mean heat index is computed to be a very hot 100.4°F (38°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Heat index details are generally centered around shaded locations and a mild breeze. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In Shelbyville, the average relative humidity in August is 77%.

Rainfall

In August, the rain falls for 17.3 days. Throughout August, 3.78" (96mm) of precipitation is accumulated. In Shelbyville, during the entire year, the rain falls for 167.2 days and collects up to 38.78" (985mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in August is 13h and 28min.
On the first day of August, sunrise is at 5:54 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 7:13 pm CDT.

Sunshine

In Shelbyville, the average sunshine in August is 9.9h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 6 in August transforms into the following instructions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Boost your sun resistance with garments that are densely woven yet spacious.