September weather forecast and climate
Chesterfield, AL

The first month of the autumn, September, is also a moderately hot month in Chesterfield, Alabama, with temperature in the range of an average high of 81.9°F (27.7°C) and an average low of 61.7°F (16.5°C).

Temperature

In September, the average high-temperature marginally drops, from a hot 87.4°F (30.8°C) in August, to a moderately hot 81.9°F (27.7°C). In Chesterfield, Alabama, the average low-temperature is 61.7°F (16.5°C).

Heat index

The average heat index in September is estimated at a hot 87.4°F (30.8°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
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 '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. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, wind, differences in body mass, height, and shape), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Chesterfield, the average relative humidity in September is 76%.

Rainfall

In September, the rain falls for 12.5 days. Throughout September, 1.22" (31mm) of precipitation is accumulated. Throughout the year, there are 157 rainfall days, and 20" (508mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Chesterfield.

Daylight

The average length of the day is 12.4h.

Sunshine

In September, the average sunshine in Chesterfield is 8.3h.

UV index

In September, the average daily maximum UV index in Chesterfield is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Chesterfield?

In September, in Chesterfield, Alabama, the average high-temperature is 81.9°F (27.7°C), and the average low-temperature is 61.7°F (16.5°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines relative humidity and air temperature, in September is calculated to 87.4°F (30.8°C).

What is the average humidity in September in Chesterfield?

In Chesterfield, Alabama, the average relative humidity in September is 76%.

How much does it rain in Chesterfield in September?

In Chesterfield, Alabama, during September, the rain falls for 12.5 days and regularly aggregates up to 1.22" (31mm) of precipitation.

When it does not snow in Chesterfield?

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

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

The average length of the day in September in Chesterfield, Alabama, is 12.4h.

How long on average sun shines in September in Chesterfield?

The average sunshine in September is 8.3h.

What is the UV index reading in September in Chesterfield?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in September - Chesterfield, AL
  • Average high temperature in September: 81.9°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (47.7°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (32.4°F).

Average pressure in September - Chesterfield, AL
  • Average pressure in September: 30.03"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.98").

Average wind speed in September - Chesterfield, AL
  • Average wind speed in September: 4.5mph

The windiest month (with the highest average wind speed) is February (7.2mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

Average humidity in September - Chesterfield, AL
  • Average humidity in September: 76%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (74%).

Average rainfall in September - Chesterfield, AL
  • Average rainfall in September: 1.22"

The wettest month (with the highest rainfall) is August (2.56").
The driest month (with the least rainfall) is October (1.06").

Average rainfall days in September - Chesterfield, AL
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (19.8 days).
The month with the least rainy days is November (7.8 days).

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

The month with the highest snowfall is February (0.28").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is January (1.3 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 - Chesterfield, 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: 9.9h).

  • Average sunshine in September: 8.3h

Months with the most sunshine are June and July (Average sunshine: 10.2h).
The month with the least sunshine is December (Average sunshine: 4.7h).

Average sunshine days in September - Chesterfield, AL
  • Average sunshine days in September: 15.3 days

The month with the most sunshine days is October (21.4 days).
The month with the least sunshine days is July (9.2 days).

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

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

Average cloud cover in September - Chesterfield, AL
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 32).

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

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