September 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 September

The first month of the autumn, September, is also a moderately hot month in Johnson City, Tennessee, with average temperature fluctuating between 77.5°F (25.3°C) and 54.9°F (12.7°C).

Temperature

In Johnson City, Tennessee, the average high-temperature is relatively the same as in August - a still moderately hot 77.5°F (25.3°C). In September, the average low-temperature is 54.9°F (12.7°C).

Humidity

In Johnson City, the average relative humidity in September is 77%.

Rainfall

The month with the least rainfall in Johnson City is September when the rain falls for 15.5 days and typically collects 1.77" (45mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in Johnson City is 12.4h.

Sunshine

In Johnson City, the average sunshine is 8.7h.

UV index

In Johnson City, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 September in Johnson City?

In September, in Johnson City, the average high-temperature is 77.5°F (25.3°C), and the average low-temperature is 54.9°F (12.7°C).

What is the average humidity in September in Johnson City?

In Johnson City, Tennessee, the average relative humidity in September is 77%.

How much does it rain in Johnson City in September?

In Johnson City, in September, it is raining for 15.5 days, with typically 1.77" (45mm) of accumulated precipitation.

What is the driest month in Johnson City?

September is the month with the least rainfall. Rain falls for 15.5 days and accumulates 1.77" (45mm) of precipitation.

Does it snow in Johnson City in September?

In Johnson City, Tennessee, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Johnson City?

May through September are months without snowfall.

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

In September, the average length of the day is 12.4h.

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

In Johnson City, Tennessee, the average sunshine in September is 8.7h.

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

The average daily maximum UV index in September in Johnson City, Tennessee, is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in September
Johnson City, TN

Average temperature in September - Johnson City, TN
  • Average high temperature in September: 25.3°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 September: 12.7°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 September
Johnson City, TN

Average pressure in September - Johnson City, TN
  • Average pressure in September: 1017.8mbar

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 September
Johnson City, TN

Average wind speed in September - Johnson City, TN
  • Average wind speed in September: 6.4km/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 September
Johnson City, TN

Average humidity in September - Johnson City, TN
  • Average humidity in September: 77%

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 September
Johnson City, TN

Average rainfall in September - Johnson City, TN
  • Average rainfall in September: 45mm

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 September
Johnson City, TN

Average rainfall days in September - Johnson City, TN
  • Average rainfall days in September: 15.5 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 September
Johnson City, TN

Average snowfall in September - Johnson City, TN
  • Average snowfall in September: 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 September
Johnson City, TN

Average snowfall days in September - Johnson City, TN
  • Average snowfall days in September: 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 September /
Average sunshine in September
Johnson City, TN

Average daylight in September / Average sunshine in September - Johnson City, TN
  • Average daylight in September: 12.4h

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 September: 8.7h

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 September
Johnson City, TN

Average sunshine days in September - Johnson City, TN
  • Average sunshine days in September: 11.9 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 September
Johnson City, TN

Average UV index in September - Johnson City, TN
  • Average UV index in September: 4

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 September
Johnson City, TN

Average cloud cover in September - Johnson City, TN
  • Average cloud cover in September: 33

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 September
Johnson City, TN

Average visibility in September - Johnson City, TN
  • Average visibility in September: 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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