September weather forecast
Shelbyville, TN

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Weather in September

September marks the beginning of fall in Shelbyville. As a transition month, the weather conditions see a significant shift from the summer heat to a more pleasant and cooler atmosphere. The month also experiences a decrease in the usual humidity, replacing it with cooler, fresher air. September witnesses a high temperature of 81.1°F (27.3°C). The picturesque environment creates an ideal setting for outdoor excursions and leisure activities.

Temperature

In Shelbyville, entering September brings a subtle temperature decrement, reducing from August's hot 86.5°F (30.3°C) to a moderately hot 81.1°F (27.3°C). During September, Shelbyville experiences an average low-temperature of 61.9°F (16.6°C) at night.

Heat index

September's mean heat index is computed to be a hot 86°F (30°C). If one persists in activity during exposure, it could induce weariness and subsequently, heat cramps.
The metrics for the heat index are tailored for both shady environments and light winds. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.

Humidity

In September, the average relative humidity is 75%.

Rainfall

September is the month with the least rainfall in Shelbyville, Tennessee. Rain falls for 13.2 days and accumulates 2.09" (53mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in September is 12h and 23min.
On the first day of September in Shelbyville, sunrise is at 6:18 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:30 pm CDT.

Sunshine

In Shelbyville, the average sunshine in September is 8.3h.

UV index

In Shelbyville, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: In September, an average UV index of 5 transforms into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. 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.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

September temperatures vary between a high-temperature of 81.1°F (27.3°C) and a low-temperature of 61.9°F (16.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in September is computed to be 86°F (30°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 13.2 days and typically collects 2.09" (53mm) of precipitation.

How much does it rain in September?

In Shelbyville, during September, the rain falls for 13.2 days and regularly aggregates up to 2.09" (53mm) of precipitation.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Shelbyville have in September?

In September, the average day length is 12h and 23min.

What time are sunrise and sunset in September in Shelbyville?

On the first day of September, sunrise is at 6:18 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:30 pm CDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.3h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
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
Shelbyville, TN

Average temperature in September - Shelbyville, TN
  • Average high temperature in September: 81.1°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (45.5°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).

Average pressure in September
Shelbyville, TN

Average pressure in September - Shelbyville, 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 (29.97"Hg).

Average wind speed in September
Shelbyville, TN

Average wind speed in September - Shelbyville, TN
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is February (8.5mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).

Average humidity in September
Shelbyville, TN

Average humidity in September - Shelbyville, TN
  • Average humidity in September: 75%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (74%).

Average rainfall in September
Shelbyville, TN

Average rainfall in September - Shelbyville, TN
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is February (4.33").
The driest month (with the least rainfall) is September (2.09").

Average rainfall days in September
Shelbyville, TN

Average rainfall days in September - Shelbyville, TN
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is November (8.9 days).

Average snowfall in September
Shelbyville, TN

Average snowfall in September - Shelbyville, TN
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Shelbyville, TN

Average snowfall days in September - Shelbyville, TN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Shelbyville, TN

Average daylight in September / Average sunshine in September - Shelbyville, 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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

Average sunshine days in September
Shelbyville, TN

Average sunshine days in September - Shelbyville, TN
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is October (19.9 days).
The month with the least sunshine days is July (10.1 days).

Average UV index in September
Shelbyville, TN

Average UV index in September - Shelbyville, 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 and December (UV index 2).

Average cloud cover in September
Shelbyville, TN

Average cloud cover in September - Shelbyville, TN
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 31).

Average visibility in September
Shelbyville, TN

Average visibility in September - Shelbyville, TN
  • Average visibility in September: 6mi

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

Shelbyville, Tennessee, USA

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