Johnson City
Tennessee, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Johnson City, TN

The front entrance to the Public Library in Johnson City, Tennessee, with flags flying on either side of the main entrance
The front entrance to the Public Library in Johnson City, Tennessee, with flags flying on either side of the main entrance
The first month of the autumn, September, is also a moderately hot month in Johnson City, Tennessee, with average temperature fluctuating between 54.9°F (12.7°C) and 77.5°F (25.3°C).

Temperature

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

Humidity

The average relative humidity in Johnson City is 77%.

Rainfall

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

Snowfall

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

Daylight

In Johnson City, the average length of the day is 12.4h.

Sunshine

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

UV index

The average daily maximum UV index in Johnson City is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Johnson City?

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

How many days does it rain in September in Johnson City?

In Johnson City, Tennessee, during September, the rain falls for 15.5 days and regularly aggregates up to 1.77" (45mm) of 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, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Johnson City?

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

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

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

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

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

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

In Johnson City, Tennessee, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Johnson City, TN
  • Average high temperature in September: 77.5°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 September: 54.9°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 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%).

Average rainfall in September - Johnson City, TN
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is February (3.27").
The driest month (with the lowest rainfall) is September (1.77").

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 lowest number of rainy days is November (11.2 days).

Average snowfall in September - Johnson City, TN
  • Average snowfall in September: 0"

The month with the highest snowfall is December (3.74").
Months with the lowest snowfall are May, June, July, August and September (0").

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 lowest number of snowfall days are June, July, August and September (0 days).

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 shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 8.7h

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

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).