September weather forecast
Birchwood, TN

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Weather in September

September, the first month of the autumn in Birchwood, is still a warm month, with an average temperature ranging between max 81°F (27.2°C) and min 59.7°F (15.4°C).

Temperature

September is characterized by a slight reduction in average high-temperature, easing from a hot 86.4°F (30.2°C) in August to a moderately hot 81°F (27.2°C). Birchwood's nighttime temperature in September falls to an average of 59.7°F (15.4°C).

Heat index

September's mean heat index is appraised at a hot 86°F (30°C). Exposure and extended activity could potentially cause a state of fatigue and lead to heat cramps.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.

Humidity

The months with the lowest humidity are January, June through November, with an average relative humidity of 76%.

Rainfall

The month with the least rainfall is September, when the rain falls for 11.7 days and typically collects 1.77" (45mm) of precipitation.

Snowfall

In Birchwood, snow does not fall in May through October.

Daylight

In September, the average length of the day in Birchwood is 12h and 23min.
On the first day of September, sunrise is at 7:12 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:24 pm EDT.

Sunshine

The average sunshine in September is 8.3h.

UV index

In Birchwood, 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 the ordinary person.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Take necessary precautions - Protection from skin and eye injury is mandatory. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Updated: Jun 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

In Birchwood, in September, the average high-temperature is 81°F (27.2°C), and the average low-temperature is 59.7°F (15.4°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is appraised at 86°F (30°C).

What is the least humid month?

The months with the lowest humidity are January, June through November, with an average relative humidity of 76%.

What is the average humidity in September?

The average relative humidity in September is 76%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 11.7 days and accumulates 1.77" (45mm) of precipitation.

How many days does it rain in September?

In Birchwood, in September, during 11.7 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

When it does not snow?

In Birchwood, snow does not fall in May through October.

How many hours of daylight does Birchwood have in September?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 7:12 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:24 pm EDT.

How many hours of sunshine does Birchwood have in September?

The average sunshine duration in September is 8.3h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to 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
Birchwood, TN

Average temperature in September - Birchwood, TN
  • Average high temperature in September: 81°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°F).

  • Average low temperature in September: 59.7°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).

Average pressure in September
Birchwood, TN

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

The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

Average wind speed in September
Birchwood, TN

Average wind speed in September - Birchwood, TN
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is February (6.6mph).
The calmest months (with the lowest average wind speed) are July and August (3.9mph).

Average humidity in September
Birchwood, TN

Average humidity in September - Birchwood, TN
  • Average humidity in September: 76%

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

Average rainfall in September
Birchwood, TN

Average rainfall in September - Birchwood, TN
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is December (3.15").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in September
Birchwood, TN

Average rainfall days in September - Birchwood, TN
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (8.7 days).

Average snowfall in September
Birchwood, TN

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

The month with the highest snowfall is January (0.51").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Birchwood, TN

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

The month with the highest number of snowfall days is January (3.4 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
Birchwood, TN

Average daylight in September / Average sunshine in September - Birchwood, 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).

Average sunshine days in September
Birchwood, TN

Average sunshine days in September - Birchwood, TN
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is July (11.5 days).

Average UV index in September
Birchwood, TN

Average UV index in September - Birchwood, 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).

Average cloud cover in September
Birchwood, TN

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

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 32).

Average visibility in September
Birchwood, TN

Average visibility in September - Birchwood, 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).

Birchwood, Tennessee, USA

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