September weather forecast
Calera, AL

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Weather in September

In Calera, Alabama, September welcomes the beginning of autumn. The average high temperature begins to decline to 85.5°F (29.7°C), marking an end to the rigorous summer heat. Lesser number of rainy days and a decreased cloud cover provide clear skies. The drop in temperature results in more comfortable nights. The decrease in daylight hours from mid-September marks a clear transition into the new season.

Temperature

The shift into September in Calera, Alabama, records an average high-temperature of a moderately hot 85.5°F (29.7°C), subtly varied from August's 90.1°F (32.3°C). Throughout the month of September, the nighttime temperature dips to an average of 65.7°F (18.7°C).

Heat index

September's mean heat index is calculated to be a very hot 95°F (35°C). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', provides an understanding of perceived warmth by combining temperature and relative humidity. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In September, the average relative humidity is 73%.

Rainfall

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

Snowfall

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

Daylight

In September, the average length of the day in Calera, Alabama, is 12h and 22min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:11 pm. On the last day of September, in Calera, Alabama, sunrise is at 6:41 am and sunset at 6:32 pm CDT.

Sunshine

The average sunshine in September in Calera is 9h.

UV index

In Calera, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, an average UV index of 5 transforms into the following instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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Frequently asked questions

How hot does it get in Calera in September?

The average high-temperature and low-temperature in Calera during September are 85.5°F (29.7°C) and 65.7°F (18.7°C) respectively. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in September is calculated to be 95°F (35°C).

What is the average humidity in September in Calera?

In Calera, the average relative humidity in September is 73%.

What is the driest month in Calera?

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

How much does it rain in Calera in September?

In Calera, Alabama, during September, the rain falls for 11.9 days and regularly aggregates up to 1.26" (32mm) of precipitation.

When it does not snow in Calera?

March through November are months without snowfall.

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

In Calera, Alabama, the average day length in September is 12h and 22min.

When are sunrise and sunset in September in Calera?

On the first day of September in Calera, sunrise is at 6:21 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:32 pm CDT.

How many hours of sunshine does Calera have in September?

In September, the average sunshine duration is 9h.

How high is the UV index in September in Calera?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
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
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"Hg

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

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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").
The 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).
The 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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 9h and 0min

The months with the most sunshine are June and July (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).

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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).
The 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

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

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Calera, Alabama, USA

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