September weather forecast and climate
Calera, AL

Weather in September

The first month of the autumn, September, is still a warm month in Calera, Alabama, with average temperature ranging between max 85.5°F (29.7°C) and min 65.7°F (18.7°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a moderately hot 85.5°F (29.7°C). In Calera, the average low-temperature is 65.7°F (18.7°C).

Heat index

The average heat index in September is evaluated at a very hot 95°F (35°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 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, pregnancy). 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. 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. 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 Calera, the average relative humidity in September is 73%.

Rainfall

September and October are months with the least rain when the rain falls for 11.9 days and typically aggregates up to 1.26" (32mm) of rain.

Snowfall

In Calera, Alabama, snow does not fall in March through November.

Daylight

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

Sunshine

In Calera, the average sunshine is 9h.

UV index

In Calera, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Calera?

In September, in Calera, Alabama, the average high-temperature is 85.5°F (29.7°C), and the average low-temperature is 65.7°F (18.7°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that represents influence of the relative humidity to air temperaure, in September is calculated to 95°F (35°C).

What is the average humidity in September in Calera?

The average relative humidity in September in Calera, Alabama, is 73%.

How many days does it rain in September in Calera?

In Calera, in September, during 11.9 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.

What is the driest month in Calera?

Months with the least rainfall in Calera are September and October Rain falls for 11.9 days and accumulates 1.26" (32mm) of rain.

When it does not snow in Calera?

March through November are months without snowfall in Calera.

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

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

How long on average sun shines in September in Calera?

In Calera, the average sunshine in September is 9h.

What is the UV index intensity in September in Calera?

The average daily maximum UV index in September in Calera, Alabama, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Calera, AL

Average temperature in September - Calera, AL
  • Average high temperature in September: 85.5°F

The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (51.4°F).

  • Average low temperature in September: 65.7°F

The month with the highest average low temperature is August (71.2°F).
The coldest month (with the lowest average low temperature) is January (36.3°F).

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Average pressure in September
Calera, AL

Average pressure in September - Calera, AL
  • Average pressure in September: 30.01"

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

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Average wind speed in September
Calera, AL

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

The windiest months (with the highest average wind speed) are January, February and March (7.3mph).
The calmest months (with the lowest average wind speed) are July and August (4.4mph).

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Average humidity in September
Calera, AL

Average humidity in September - Calera, AL
  • Average humidity in September: 73%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Calera, AL

Average rainfall in September - Calera, AL
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is August (2.52").
The driest months (with the least rainfall) are September and October (1.26").

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Average rainfall days in September
Calera, AL

Average rainfall days in September - Calera, AL
  • Average rainfall days in September: 11.9 days

The month with the highest number of rainy days is July (19.7 days).
The month with the least rainy days is November (6.7 days).

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Average snowfall in September
Calera, AL

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

The month with the highest snowfall is December (0.47").
Months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Calera, AL

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

The month with the highest number of snowfall days is January (1 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Calera, AL

Average daylight in September / Average sunshine in September - Calera, AL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9h

Months with the most sunshine are June and July (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.9).

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Average sunshine days in September
Calera, AL

Average sunshine days in September - Calera, AL
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (21.9 days).
The month with the least sunshine days is July (9 days).

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Average UV index in September
Calera, AL

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

The month with the highest UV index is June (UV index 7).
Months with the lowest UV index are January, February and December (UV index 3).

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Average cloud cover in September
Calera, AL

Average cloud cover in September - Calera, AL
  • Average cloud cover in September: 29

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in September
Calera, AL

Average visibility in September - Calera, AL
  • Average visibility in September: 6mi

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

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