September weather forecast and climate
Chapman, AL

The first month of the autumn, September, is still a tropical month in Chapman, 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 essentially the same as in August - a still tropical 87.1°F (30.6°C). In September, the average low-temperature is 67.8°F (19.9°C).

Heat index

In September, the average heat index is appraised at a sweltering 99.9°F (37.7°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like wind, clothing, differences in body mass, height, and shape, and activity influence one's weather impression. 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 especially crucial 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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 Chapman, the average relative humidity is 74%.

Rainfall

In Chapman, during September, the rain falls for 15.4 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, there are 171.8 rainfall days, and 35.16" (893mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall.

Daylight

The average length of the day in Chapman, Alabama, is 12.3h.

Sunshine

The average sunshine in September is 8.9h.

UV index

In Chapman, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Chapman?

In September, in Chapman, 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', 'feels like'), that represents influence of the relative humidity to air temperaure, is evaluated at 99.9°F (37.7°C).

What is the average humidity in September in Chapman?

The average relative humidity in September in Chapman, Alabama, is 74%.

How many days does it rain in September in Chapman?

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

When it does not snow in Chapman?

April through November are months without snowfall in Chapman, Alabama.

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

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

How long on average sun shines in September in Chapman?

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

How high is the UV index in September in Chapman?

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV rays.
Average temperature in September - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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 - Chapman, 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).