September weather forecast and climate
Collirene, AL

The first month of the autumn, September, is still a hot month in Collirene, Alabama, with average temperature ranging between min 67.1°F (19.5°C) and max 87.6°F (30.9°C).

Temperature

In Collirene, the average high-temperature in September is essentially the same as in August - a still hot 87.6°F (30.9°C). The average low-temperature, in Collirene, is 67.1°F (19.5°C).

Heat index

In September, the average heat index is calculated to a torrid 100.2°F (37.9°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'feels like', 'apparent temperature', 'real feel', 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 (clothing, 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. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. 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

The average relative humidity in Collirene, Alabama, is 72%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 1.93" (49mm) of precipitation.

Snowfall

In Collirene snow does not fall in April through November.

Daylight

In Collirene, the average length of the day is 12.3h.

Sunshine

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

UV index

In Collirene, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. 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.

What is the temperature in September in Collirene?

In Collirene, in September, the average high-temperature is 87.6°F (30.9°C), and the average low-temperature is 67.1°F (19.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that takes the relative humidity and factores it into the air temperature reading, in September is calculated to 100.2°F (37.9°C).

What is the average humidity in September in Collirene?

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

How many days does it rain in September in Collirene?

In Collirene, in September, during 12.6 rainfall days, 1.93" (49mm) of precipitation is typically accumulated.

What is the driest month in Collirene?

The month with the least rainfall in Collirene, Alabama, is September when the rain falls for 12.6 days and typically collects 1.93" (49mm) of precipitation.

When it does not snow in Collirene?

In Collirene snow does not fall in April through November.

How many hours of daylight does Collirene have in September?

In September, the average length of the day is 12.3h.

How many hours of sunshine does Collirene have in September?

In September, the average sunshine is 9h.

What is the UV index reading in September in Collirene?

In Collirene, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Collirene, AL
  • Average high temperature in September: 87.6°F

The warmest month (with the highest average high temperature) is July (92.1°F).
The month with the lowest average high temperature is January (54.3°F).

  • Average low temperature in September: 67.1°F

Months with the highest average low temperature are July and August (72°F).
The coldest month (with the lowest average low temperature) is January (38.5°F).

Average pressure in September - Collirene, 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 - Collirene, AL
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is February (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

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

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (69%).

Average rainfall in September - Collirene, AL
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is December (3.82").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in September - Collirene, AL
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (20.5 days).
The month with the least rainy days is November (7.8 days).

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

The month with the highest snowfall is January (0.35").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

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

The month with the highest number of snowfall days is January (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 - Collirene, 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: 9h

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

Average sunshine days in September - Collirene, AL
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is October (21.7 days).
The month with the least sunshine days is July (8 days).

Average UV index in September - Collirene, AL
  • Average UV index in September: 6

Months with the highest UV index are 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 - Collirene, AL
  • Average cloud cover in September: 30

Months with the most cloud cover are February and December (Cloud cover 47).
Months with the least cloud cover are September and October (Cloud cover 30).

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

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