September weather forecast and climate
Commerce, AL

The first month of the autumn, September, is still a tropical month in Commerce, Alabama, with temperature in the range of an average low of 67.8°F (19.9°C) and an average high of 87.1°F (30.6°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still hot 87.1°F (30.6°C). The average low-temperature, in September, is 67.8°F (19.9°C).

Heat index

In September, the average heat index is appraised at a very hot 99.9°F (37.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, wind, clothing). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

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

Rainfall

In Commerce, in September, during 15.4 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. Throughout the year, in Commerce, there are 171.8 rainfall days, and 35.16" (893mm) of precipitation is accumulated.

Snowfall

In Commerce snow does not fall in April through November.

Daylight

The average length of the day in September is 12.3h.

Sunshine

In Commerce, the average sunshine is 8.9h.

UV index

In September, the average daily maximum UV index in Commerce is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Commerce?

In Commerce, Alabama, in September, the average high-temperature is 87.1°F (30.6°C), and the average low-temperature is 67.8°F (19.9°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines relative humidity and air temperature, is appraised at 99.9°F (37.7°C).

What is the average humidity in September in Commerce?

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

How many days does it rain in September in Commerce?

In Commerce, Alabama, in September, it is raining for 15.4 days, with typically 2.28" (58mm) of accumulated precipitation.

When it does not snow in Commerce?

April through November are months without snowfall.

What is the average length of the day in September in Commerce?

In Commerce, the average length of the day in September is 12.3h.

How long on average sun shines in September in Commerce?

The average sunshine in September in Commerce, Alabama, is 8.9h.

What is the UV index reading in September in Commerce?

In September, the average daily maximum UV index in Commerce is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to the UV radiation.
Average temperature in September - Commerce, AL
  • Average high temperature in September: 87.1°F

The warmest month (with the highest average high temperature) is July (91.8°F).
The month with the lowest average high temperature is January (56.7°F).

  • Average low temperature in September: 67.8°F

The month with the highest average low temperature is August (72.1°F).
The coldest month (with the lowest average low temperature) is January (39°F).

Average pressure in September - Commerce, AL
  • Average pressure in September: 29.99"

The month with the highest atmospheric pressure is January (30.16").
Months with the lowest atmospheric pressure are June and August (29.97").

Average wind speed in September - Commerce, AL
  • Average wind speed in September: 5mph

The windiest months (with the highest average wind speed) are January and February (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

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

Months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September - Commerce, AL
  • Average rainfall in September: 2.28"

The wettest months (with the highest rainfall) are August and December (3.94").
The driest month (with the least rainfall) is November (1.93").

Average rainfall days in September - Commerce, AL
  • Average rainfall days in September: 15.4 days

The month with the highest number of rainy days is July (23 days).
The month with the least rainy days is November (7.3 days).

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

Months with the highest snowfall are January and February (0.2").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

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

The month with the highest number of snowfall days is January (0.4 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Commerce, AL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.2h).
The month with the shortest days is December (Average daylight: 10.1h).

  • Average sunshine in September: 8.9h

The month with the most sunshine is June (Average sunshine: 10.8h).
Months with the least sunshine are February and December (Average sunshine: 5.1).

Average sunshine days in September - Commerce, AL
  • Average sunshine days in September: 12.9 days

Months with the most sunshine days are October and November (21 days).
The month with the least sunshine days is July (6.5 days).

Average UV index in September - Commerce, AL
  • Average UV index in September: 6

Months with the highest UV index are May, June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 3).

Average cloud cover in September - Commerce, AL
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is October (Cloud cover 29).

Average visibility in September - Commerce, AL
  • Average visibility in September: 5mi

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