September weather forecast
Killen, AL

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Weather in September

September, the first month of the autumn in Killen, is also a moderately hot month, with an average temperature fluctuating between 63.5°F (17.5°C) and 82.8°F (28.2°C).

Temperature

The shift from August to September includes a small decrease in the average high-temperature, from a hot 88.3°F (31.3°C) to a moderately hot 82.8°F (28.2°C). In September, Killen reports a consistent average low-temperature of 63.5°F (17.5°C) during the nights.

Heat index

September's mean heat index is calculated to be a hot 89.6°F (32°C). Uninterrupted activity during exposure could lead to a sense of exhaustion, possibly causing heat cramps.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In September, the average relative humidity in Killen is 74%.

Rainfall

The month with the least rainfall in Killen is September, when the rain falls for 12.7 days and typically collects 2.05" (52mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In Killen, the average length of the day in September is 12h and 23min.
On the first day of September in Killen, sunrise is at 6:23 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:35 pm CDT.

Sunshine

In September, the average sunshine is 8.9h.

UV index

In September, the average daily maximum UV index in Killen is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 5 in September translates into these instructions:
Ensure safety - Recommendations to avert sunburn are presented. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

How hot is September in Killen?

The high-temperature, in September, in Killen, records 82.8°F (28.2°C), while the low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is calculated to be 89.6°F (32°C).

What is the average humidity in September in Killen?

In Killen, Alabama, the average relative humidity in September is 74%.

What is the driest month in Killen?

The month with the least rainfall in Killen, Alabama, is September, when the rain falls for 12.7 days and typically collects 2.05" (52mm) of precipitation.

How many days does it rain in September in Killen?

In Killen, in September, during 12.7 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

When it does not snow in Killen?

In Killen, snow does not fall in April through October.

How many hours of daylight does Killen have in September?

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

When is the sunrise / sunset in September in Killen?

In September, on the first day of the month, sunrise is at 6:23 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:35 pm CDT.

How many hours of sunshine does Killen have in September?

In September, the average sunshine duration in Killen, Alabama, is 8.9h.

How high is the UV index in September in Killen?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health threat 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
Killen, AL

Average temperature in September - Killen, AL
  • Average high temperature in September: 82.8°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (47.7°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (33.3°F).

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Average pressure in September
Killen, AL

Average pressure in September - Killen, AL
  • Average pressure in September: 30.02"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).

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Average wind speed in September
Killen, AL

Average wind speed in September - Killen, AL
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is February (8.4mph).
The calmest month (with the lowest average wind speed) is July (4.8mph).

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Average humidity in September
Killen, AL

Average humidity in September - Killen, AL
  • Average humidity in September: 74%

The months with the highest relative humidity are March and December (79%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Killen, AL

Average rainfall in September - Killen, AL
  • Average rainfall in September: 2.05"

The wettest month (with the highest rainfall) is February (3.58").
The driest month (with the least rainfall) is September (2.05").

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Average rainfall days in September
Killen, AL

Average rainfall days in September - Killen, AL
  • Average rainfall days in September: 12.7 days

The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is November (9.7 days).

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Average snowfall in September
Killen, AL

Average snowfall in September - Killen, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.31").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Killen, AL

Average snowfall days in September - Killen, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Killen, AL

Average daylight in September / Average sunshine in September - Killen, AL
  • 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 54min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).

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Average sunshine days in September
Killen, AL

Average sunshine days in September - Killen, AL
  • Average sunshine days in September: 15.2 days

The months with the most sunshine days are October and November (18.8 days).
The month with the least sunshine days is July (10.4 days).

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Average UV index in September
Killen, AL

Average UV index in September - Killen, AL
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
Killen, AL

Average cloud cover in September - Killen, AL
  • Average cloud cover in September: 30

The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 29).

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Average visibility in September
Killen, AL

Average visibility in September - Killen, AL
  • Average visibility in September: 6mi

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

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Killen, Alabama, USA

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