September weather forecast
Commerce, AL

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Weather in September

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

Temperature

September's average high-temperature is a still hot 87.1°F (30.6°C), maintaining a close comparison with August's 90.7°F (32.6°C). The low-temperature averages to an enjoyable 67.8°F (19.9°C) during the nights of September.

Heat index

The heat index for September is calculated to be a very hot 100.4°F (38°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Consider that heat index readings are for situations in the shade and light wind. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', determines the feeling of heat when you account for the relative humidity. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. 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.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

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. In Commerce, during the entire year, the rain falls for 171.8 days and collects up to 35.16" (893mm) of precipitation.

Snowfall

In Commerce, snow does not fall in April through November.

Daylight

The average length of the day in September is 12h and 21min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:11 pm. On the last day of September, sunrise is at 6:41 am and sunset at 6:33 pm CDT.

Sunshine

In Commerce, the average sunshine in September is 8.9h.

UV index

In Commerce, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.
Note: In September, a daily UV index of 6 turns into the following recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot during September?

The high-temperature, in September, in Commerce, records 87.1°F (30.6°C), while the low-temperature is 67.8°F (19.9°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in September is calculated to be 100.4°F (38°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How much does it rain in September?

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

When it does not snow?

April through November are months without snowfall.

What is the average length of the day in September?

In September, the average day length is 12h and 21min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:23 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:33 pm CDT.

How many hours of sunshine does Commerce have in September?

The average sunshine duration in September is 8.9h.

How high is the UV index in September?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe 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
Commerce, AL

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

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

Average wind speed in September
Commerce, AL

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

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

The months with the highest snowfall are January and February (0.2").
The 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 - Commerce, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.4 days).
The 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 / Average sunshine in September - Commerce, AL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).

Average sunshine days in September
Commerce, AL

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

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

The months with the highest UV index are May, June, July and August (UV index 7).
The 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 - 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 - Commerce, AL
  • Average visibility in September: 5mi

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

Commerce, Alabama, USA

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