September weather - Autumn 2024

Weather in September
Frequently asked questions
Average temperature in September
Average pressure in September
Average wind speed in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall in September
Average snowfall days in September
Average daylight in September
Average sunshine in September
Average sunshine days in September
Average UV index in September
Average cloud cover in September
Average visibility in September

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

Weather in September

September serves as a bridge between the sultry summer and the crisp autumn in Johnson City. The distinctive onset of cooler temperatures and shorter days earmarks the change of season. While nestled in the quintessential charm of summer, the city begins to showcase colorful leaves and cooler evenings. Precipitation declines to 1.77" (45mm), permitting observers to appreciate the clear skies and changing foliage. As the daylight recedes, the sun holds its ground, continuing to radiate warmth and brightness throughout September.

Temperature

The average high-temperature in Johnson City, Tennessee, during September is a still moderately hot 77.5°F (25.3°C), almost matching the conditions of the preceding month. In Johnson City, following the steep rise of daytime temperatures, an average nighttime low of 54.9°F (12.7°C) is anticipated during September.

Humidity

The average relative humidity in September in Johnson City is 77%.

Rainfall

The month with the least rainfall 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

In Johnson City, the average length of the day in September is 12h and 24min.
On the first day of September in Johnson City, sunrise is at 7:01 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:13 pm EDT.

Sunshine

In September, the average sunshine in Johnson City 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 exposure to the Sun's UV rays for the ordinary person.
Note: A daily high UV index of 4 in September leads to these guidelines:
Take precautions - Protection against sunburn is recommended. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.

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Frequently asked questions

What are the temperatures in Johnson City in September?

The average high-temperature, in September, in Johnson City, is 77.5°F (25.3°C), while the average low-temperature is 54.9°F (12.7°C). The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 89.6°F (32°C).

What is the average humidity in September in Johnson City?

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

What is the driest month in Johnson City?

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

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

In Johnson City, Tennessee, in September, during 15.5 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

When it does not snow in Johnson City?

May through September are months without snowfall in Johnson City.

Does it snow in Johnson City in September?

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

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

In September, the average day length is 12h and 24min.

What time are sunrise and sunset in September in Johnson City?

In September, on the first day of the month, sunrise is at 7:01 am and sunset at 7:56 pm. On the last day of the month, in Johnson City, sunrise is at 7:24 am and sunset at 7:13 pm EDT.

How long on average sun shines in September in Johnson City?

In September, the average sunshine duration is 8.7h.

How high is the UV index in September in Johnson City?

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

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

82.6°F 28.1°C

77.5°F 25.3°C

65.8°F 18.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

4mph 6.4km/h

4.2mph 6.8km/h

5.4mph 8.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

9.8

11.9

16.5

Average UV index

Average cloud cover

Average visibility

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).

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Average pressure in September
Johnson City, TN

Average pressure in September: 30.06"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).

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Average wind speed in September
Johnson City, TN

Average wind speed in September: 4mph

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).

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Average humidity in September
Johnson City, TN

Average humidity in September: 77%

The 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: 1.77"

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

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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: 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").

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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).
The 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: 12h and 2min

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 September: 8h and 4min

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).

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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: 4

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).

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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).
The 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: 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).

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September weather forecast
Johnson City, TN

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