September weather forecast and climate
Collinsville, AL

September, the first month of the autumn, in Collinsville, is also a moderately hot month, with temperature in the range of an average low of 62.4°F (16.9°C) and an average high of 82.2°F (27.9°C).

Temperature

In September, the average high-temperature is practically the same as in August - a warm 82.2°F (27.9°C). The average low-temperature, in Collinsville, Alabama, is 62.4°F (16.9°C).

Heat index

In September, the average heat index is evaluated at a tropical 88°F (31.1°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like wind, clothing, metabolic differences, 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.

Humidity

The average relative humidity in Collinsville, Alabama, is 75%.

Rainfall

In September, in Collinsville, Alabama, the rain falls for 14.7 days. Throughout September, 2.68" (68mm) of precipitation is accumulated. Throughout the year, there are 184 rainfall days, and 43.54" (1106mm) of precipitation is accumulated.

Snowfall

In Collinsville snow does not fall in April through October.

Daylight

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

Sunshine

In September, the average sunshine is 8.6h.

UV index

The average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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.

What is the temperature in September in Collinsville?

In September, in Collinsville, the average high-temperature is 82.2°F (27.9°C), and the average low-temperature is 62.4°F (16.9°C). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines both air temperature and relative humidity, is evaluated at 88°F (31.1°C).

What is the average humidity in September in Collinsville?

The average relative humidity in September is 75%.

How many days does it rain in September in Collinsville?

In September, in Collinsville, the rain falls for 14.7 days. Throughout September, 2.68" (68mm) of precipitation is accumulated.

When it does not snow in Collinsville?

April through October are months without snowfall.

How many hours of daylight does Collinsville have in September?

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

How long on average sun shines in September in Collinsville?

In September, the average sunshine in Collinsville, Alabama, is 8.6h.

How high is the UV index in September in Collinsville?

In Collinsville, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV rays.
Average temperature in September - Collinsville, AL
  • Average high temperature in September: 82.2°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (48.7°F).

  • Average low temperature in September: 62.4°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (32.9°F).

Average pressure in September - Collinsville, AL
  • Average pressure in September: 30.02"

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 - Collinsville, AL
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is February (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.3mph).

Average humidity in September - Collinsville, AL
  • Average humidity in September: 75%

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

Average rainfall in September - Collinsville, AL
  • Average rainfall in September: 2.68"

The wettest months (with the highest rainfall) are February and December (4.49").
The driest month (with the least rainfall) is October (2.64").

Average rainfall days in September - Collinsville, AL
  • Average rainfall days in September: 14.7 days

The month with the highest number of rainy days is July (21.6 days).
The month with the least rainy days is November (10.1 days).

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

The month with the highest snowfall is February (0.79").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is February (1.4 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Collinsville, 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: 8.6h

The month with the most sunshine is June (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.8h).

Average sunshine days in September - Collinsville, AL
  • Average sunshine days in September: 13.3 days

The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is July (7.3 days).

Average UV index in September - Collinsville, 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 - Collinsville, AL
  • Average cloud cover in September: 30

The month with the most cloud cover is February (Cloud cover 49).
Months with the least cloud cover are June and September (Cloud cover 30).

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

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