August weather forecast and climate
Johnson City, TN

The front entrance to the Public Library in Johnson City, Tennessee
The front entrance to the Public Library in Johnson City, Tennessee

Weather in August

The last month of the summer, August, is another warm month in Johnson City, Tennessee, with average temperature fluctuating between 82.6°F (28.1°C) and 59.5°F (15.3°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still moderately hot 82.6°F (28.1°C). In Johnson City, in August, the average low-temperature is 59.5°F (15.3°C).

Heat index

The average heat index is appraised at a tropical 89.1°F (31.7°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like pregnancy, clothing, wind, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In August, the average relative humidity in Johnson City is 76%.

Rainfall

In Johnson City, during August, the rain falls for 17.7 days and regularly aggregates up to 2.64" (67mm) of precipitation. Throughout the year, in Johnson City, Tennessee, there are 187.8 rainfall days, and 32.76" (832mm) of precipitation is accumulated.

Snowfall

In Johnson City snow does not fall in May through September.

Daylight

In Johnson City, the average length of the day is 13.5h.

Sunshine

In August, the average sunshine is 10.5h.

UV index

Months with the highest UV index in Johnson City are June through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in Johnson City?

In August, in Johnson City, Tennessee, the average high-temperature is 82.6°F (28.1°C), and the average low-temperature is 59.5°F (15.3°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), that calculates temperature value influenced by the moisture in the air, in August is calculated to 89.1°F (31.7°C).

What is the average humidity in August in Johnson City?

In August, the average relative humidity is 76%.

How much does it rain in Johnson City in August?

In Johnson City, Tennessee, during August, the rain falls for 17.7 days and regularly aggregates up to 2.64" (67mm) of precipitation.

When it does not snow in Johnson City?

In Johnson City, Tennessee, snow does not fall in May through September.

What is the average length of the day in August in Johnson City?

In Johnson City, Tennessee, the average length of the day in August is 13.5h.

How many hours of sunshine does Johnson City have in August?

In August, the average sunshine in Johnson City is 10.5h.

What are the months with the highest UV index in Johnson City?

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

What is the UV index intensity in August in Johnson City?

In Johnson City, the average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents a high health threat from the exposure to the Sun's UV rays.

Average temperature in August
Johnson City, TN

Average temperature in August - Johnson City, TN
  • Average high temperature in August: 28.1°C

The warmest month (with the highest average high temperature) is July (28.5°C).
The month with the lowest average high temperature is January (5.3°C).

  • Average low temperature in August: 15.3°C

The month with the highest average low temperature is July (15.9°C).
The coldest month (with the lowest average low temperature) is January (-3°C).

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Average pressure in August
Johnson City, TN

Average pressure in August - Johnson City, TN
  • Average pressure in August: 1016.8mbar

The month with the highest atmospheric pressure is November (1021.3mbar).
The month with the lowest atmospheric pressure is June (1015.7mbar).

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Average wind speed in August
Johnson City, TN

Average wind speed in August - Johnson City, TN
  • Average wind speed in August: 5.9km/h

The windiest month (with the highest average wind speed) is April (10.6km/h).
The calmest month (with the lowest average wind speed) is August (5.9km/h).

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Average humidity in August
Johnson City, TN

Average humidity in August - Johnson City, TN
  • Average humidity in August: 76%

Months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is November (75%).

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Average rainfall in August
Johnson City, TN

Average rainfall in August - Johnson City, TN
  • Average rainfall in August: 67mm

The wettest month (with the highest rainfall) is February (83mm).
The driest month (with the least rainfall) is September (45mm).

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Average rainfall days in August
Johnson City, TN

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).

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Average snowfall in August
Johnson City, TN

Average snowfall in August - Johnson City, TN
  • Average snowfall in August: 0mm

The month with the highest snowfall is December (95mm).
Months with the least snowfall are May, June, July, August and September (0mm).

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Average snowfall days in August
Johnson City, TN

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).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Johnson City, TN

Average daylight in August / Average sunshine in August - Johnson City, TN
  • Average daylight in August: 13.5h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in August: 10.5h

The month with the most sunshine is June (Average sunshine: 10.6h).
The month with the least sunshine is January (Average sunshine: 5h).

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Average sunshine days in August
Johnson City, TN

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).

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Average UV index in August
Johnson City, TN

Average UV index in August - Johnson City, TN
  • Average UV index in August: 6

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February and December (UV index 2).

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Average cloud cover in August
Johnson City, TN

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).
Months with the least cloud cover are June and August (Cloud cover 31).

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Average visibility in August
Johnson City, TN

Average visibility in August - Johnson City, TN
  • Average visibility in August: 8km

Months with the highest visibility are April, June, July, October and November (9km).
Months with the lowest visibility are January, February, March, May, August, September and December (8km).

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