September weather forecast
Signal Mountain, TN

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Weather in September

September, the first month of the autumn in Signal Mountain, is also a moderately hot month, with an average temperature varying between 80.8°F (27.1°C) and 60.4°F (15.8°C).

Temperature

The shift from August to September includes a small decrease in the average high-temperature, from a tropical 86.5°F (30.3°C) to a moderately hot 80.8°F (27.1°C). The average low-temperature of 60.4°F (15.8°C) is witnessed during September.

Heat index

The heat index in September is calculated to be a hot 86°F (30°C). If one continues to be active during enduring exposure, it could result in fatigue and heat cramps.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.

Humidity

June through November, with an average relative humidity of 76%, are the least humid months in Signal Mountain.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.5 days and typically collects 2.76" (70mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day in Signal Mountain, Tennessee, is 12h and 23min.
On the first day of the month, sunrise is at 7:14 am and sunset at 8:07 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:26 pm EDT.

Sunshine

In Signal Mountain, Tennessee, the average sunshine in September is 8.4h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 5 during September translates into the following directions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
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Frequently asked questions

What is the usual temperature for Signal Mountain in September?

September temperatures in Signal Mountain, Tennessee, vary between a high-temperature of 80.8°F (27.1°C) and a low-temperature of 60.4°F (15.8°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 86°F (30°C).

What are the least humid months in Signal Mountain?

June through November, with an average relative humidity of 76%, are the least humid months in Signal Mountain.

What is the average humidity in September in Signal Mountain?

In September, the average relative humidity in Signal Mountain, Tennessee, is 76%.

What is the driest month in Signal Mountain?

September is the month with the least rainfall in Signal Mountain. Rain falls for 13.5 days and accumulates 2.76" (70mm) of precipitation.

How much does it rain in Signal Mountain in September?

In Signal Mountain, in September, it is raining for 13.5 days, with typically 2.76" (70mm) of accumulated precipitation.

When it does not snow in Signal Mountain?

In Signal Mountain, snow does not fall in May through October.

What is the average length of the day in September in Signal Mountain?

In September, the average day length in Signal Mountain, Tennessee, is 12h and 23min.

When is the sunrise / sunset in September in Signal Mountain?

In September, on the first day of the month, sunrise is at 7:14 am and sunset at 8:07 pm. On the last day of the month, in Signal Mountain, sunrise is at 7:35 am and sunset at 7:26 pm EDT.

How many hours of sunshine does Signal Mountain have in September?

In Signal Mountain, the average sunshine duration in September is 8.4h.

How high is the UV index in September in Signal Mountain?

The average daily maximum UV index in September in Signal Mountain, Tennessee, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Signal Mountain, TN

Average temperature in September - Signal Mountain, TN
  • Average high temperature in September: 80.8°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (45.1°F).

  • Average low temperature in September: 60.4°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

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Average pressure in September
Signal Mountain, TN

Average pressure in September - Signal Mountain, TN
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

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Average wind speed in September
Signal Mountain, TN

Average wind speed in September - Signal Mountain, TN
  • Average wind speed in September: 4.1mph

The windiest month (with the highest average wind speed) is February (6.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

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Average humidity in September
Signal Mountain, TN

Average humidity in September - Signal Mountain, TN
  • Average humidity in September: 76%

The month with the highest relative humidity is December (81%).
The months with the lowest relative humidity are June, July, August, September, October and November (76%).

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Average rainfall in September
Signal Mountain, TN

Average rainfall in September - Signal Mountain, TN
  • Average rainfall in September: 2.76"

The wettest month (with the highest rainfall) is December (4.53").
The driest month (with the least rainfall) is September (2.76").

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Average rainfall days in September
Signal Mountain, TN

Average rainfall days in September - Signal Mountain, TN
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is November (10.5 days).

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Average snowfall in September
Signal Mountain, TN

Average snowfall in September - Signal Mountain, TN
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.01").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Signal Mountain, TN

Average snowfall days in September - Signal Mountain, TN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Signal Mountain, TN

Average daylight in September / Average sunshine in September - Signal Mountain, TN
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).

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Average sunshine days in September
Signal Mountain, TN

Average sunshine days in September - Signal Mountain, TN
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is July (7.7 days).

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Average UV index in September
Signal Mountain, TN

Average UV index in September - Signal Mountain, TN
  • Average UV index in September: 5

The months with the highest UV index are May, 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
Signal Mountain, TN

Average cloud cover in September - Signal Mountain, TN
  • Average cloud cover in September: 32

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 31).

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Average visibility in September
Signal Mountain, TN

Average visibility in September - Signal Mountain, TN
  • Average visibility in September: 5mi

The months with the highest visibility are June, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, July, August, September and December (5mi).

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Signal Mountain, Tennessee, USA

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