August weather forecastJohnson City, TN
August
Weather in August
Despite the slight dip in temperature from July to August, Johnson City continues to exude summer warmth. Infrequent showers intersperse the warm days, offering momentary coolness to residents and visitors. The flexing strength of the sun creates dazzling outdoor scenery, inviting exploration and enjoyment. Wind speed reduces, fostering an atmosphere of tranquility and peace. The receding daylight asserts the approach of autumn, as the summer gradually winds down.Temperature
The advent of August sees the average high-temperature at a still warm 82.6°F (28.1°C), subtly shifted from July's 83.3°F (28.5°C). Throughout the month of August, Johnson City observes a dramatic downturn from the daytime peak temperatures, expecting an average low of 59.5°F (15.3°C).Heat index
August's average heat index is computed to be a tropical 89.6°F (32°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.Understanding the heat index involves considering values for shaded locales with light wind. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Humidity
The average relative humidity in August is 76%.Rainfall
In Johnson City, in August, it is raining for 17.7 days, with typically 2.64" (67mm) of accumulated precipitation. Throughout the year, there are 187.8 rainfall days, and 32.76" (832mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Johnson City, the average length of the day in August is 13h and 30min.On the first day of August, sunrise is at 6:36 am and sunset at 8:34 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 7:58 pm EDT.
Sunshine
In Johnson City, the average sunshine in August is 10.5h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.Note: A daily high UV index of 6 in August leads to these guidelines:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Johnson City, TN
- Average high temperature in August: 82.6°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in August: 59.5°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).
Average pressure in August
Johnson City, TN
- Average pressure in August: 30.03"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in August
Johnson City, TN
- Average wind speed in August: 3.7mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in August
Johnson City, TN
- Average humidity in August: 76%
The months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is November (75%).
Average rainfall in August
Johnson City, TN
- Average rainfall in August: 2.64"
The wettest month (with the highest rainfall) is February (3.27").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in August
Johnson City, TN
- Average rainfall days in August: 17.7 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (11.2 days).
Average snowfall in August
Johnson City, TN
- Average snowfall in August: 0"
The month with the highest snowfall is December (3.74").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Johnson City, TN
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Johnson City, TN
- Average daylight in August: 13h and 30min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in August: 10h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in August
Johnson City, TN
- Average sunshine days in August: 9.8 days
The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is July (8.3 days).
Average UV index in August
Johnson City, TN
- Average UV index in August: 6
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in August
Johnson City, TN
- Average cloud cover in August: 31
The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are June and August (Cloud cover 31).
Average visibility in August
Johnson City, TN
- Average visibility in August: 5mi
The months with the highest visibility are April, June, July, October and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September and December (5mi).
