September weather forecast and climate
Birmingham, AL

The colorful evening sky in Birmingham City, Alabama
The colorful evening sky in Birmingham City, Alabama
September, the first month of the autumn, in Birmingham, is still a warm month, with average temperature ranging between max 84.9°F (29.4°C) and min 65.3°F (18.5°C).

Temperature

In September, the average high-temperature is practically the same as in August - a warm 84.9°F (29.4°C). In Birmingham, the average low-temperature is 65.3°F (18.5°C).

Heat index

In September, the average heat index is estimated at a hot 93.2°F (34°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. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', 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 individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, pregnancy, clothing), and activity. 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.

Humidity

The average relative humidity in Birmingham is 72%.

Rainfall

In Birmingham, it is raining for 12.1 days, with typically 1.1" (28mm) of accumulated precipitation. In Birmingham, during the entire year, the rain falls for 143.1 days and collects up to 18.58" (472mm) of precipitation.

Snowfall

April through October are months without snowfall in Birmingham, Alabama.

Daylight

In Birmingham, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 8.8h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Birmingham?

The average high-temperature, in September, in Birmingham, is 84.9°F (29.4°C), while the average low-temperature is 65.3°F (18.5°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines both air temperature and relative humidity, in September is estimated at 93.2°F (34°C).

What is the average humidity in September in Birmingham?

The average relative humidity in September in Birmingham is 72%.

How many days does it rain in September in Birmingham?

In Birmingham, Alabama, during September, the rain falls for 12.1 days and regularly aggregates up to 1.1" (28mm) of precipitation.

When it does not snow in Birmingham?

In Birmingham snow does not fall in April through October.

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

In Birmingham, Alabama, the average length of the day in September is 12.4h.

How many hours of sunshine does Birmingham have in September?

The average sunshine in September in Birmingham, Alabama, is 8.8h.

What is the UV index reading in September in Birmingham?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Birmingham, AL
  • Average high temperature in September: 29.4°C

The warmest month (with the highest average high temperature) is July (32.8°C).
The month with the lowest average high temperature is January (10.4°C).

  • Average low temperature in September: 18.5°C

The month with the highest average low temperature is July (21.7°C).
The coldest month (with the lowest average low temperature) is January (1.8°C).

Average pressure in September - Birmingham, AL
  • Average pressure in September: 1016.3mbar

The month with the highest atmospheric pressure is January (1021.7mbar).
The month with the lowest atmospheric pressure is June (1015.1mbar).

Average wind speed in September - Birmingham, AL
  • Average wind speed in September: 7.8km/h

The windiest month (with the highest average wind speed) is February (11.9km/h).
The calmest months (with the lowest average wind speed) are July and August (7.2km/h).

Average humidity in September - Birmingham, AL
  • Average humidity in September: 72%

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

Average rainfall in September - Birmingham, AL
  • Average rainfall in September: 28mm

The wettest month (with the highest rainfall) is June (50mm).
The driest month (with the least rainfall) is November (26mm).

Average rainfall days in September - Birmingham, AL
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (7.9 days).

Average snowfall in September - Birmingham, AL
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (3mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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

Months with the highest number of snowfall days are January and February (0.8 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 - Birmingham, AL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 8.8h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.7h).

Average sunshine days in September - Birmingham, AL
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is October (20.9 days).
The month with the least sunshine days is July (11.1 days).

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

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

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

The month with the most cloud cover is February (Cloud cover 48).
Months with the least cloud cover are June and September (Cloud cover 30).

Average visibility in September - Birmingham, AL
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).