September weather forecast and climate
Mount Vernon, AL

Weather in September

The first month of the autumn, September, is still a tropical month in Mount Vernon, Alabama, with temperature in the range of an average high of 88.2°F (31.2°C) and an average low of 70.7°F (21.5°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still tropical 88.2°F (31.2°C). The average low-temperature, in Mount Vernon, Alabama, is 70.7°F (21.5°C).

Heat index

The average heat index is appraised at a very hot 103.6°F (39.8°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 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, wind, pregnancy), and activity. 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. 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 exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Mount Vernon, in September, during 15.3 rainfall days, 2.48" (63mm) of precipitation is typically accumulated. Throughout the year, there are 156.2 rainfall days, and 33.35" (847mm) of precipitation is accumulated.

Snowfall

March through December are months without snowfall.

Daylight

The average length of the day in September is 12.3h.

Sunshine

The average sunshine in September is 9.4h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Mount Vernon?

The average high-temperature, in September, in Mount Vernon, is 88.2°F (31.2°C), while the average low-temperature is 70.7°F (21.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that represents influence of the relative humidity to air temperaure, in September is evaluated at 103.6°F (39.8°C).

What is the average humidity in September in Mount Vernon?

In Mount Vernon, the average relative humidity in September is 75%.

How many days does it rain in September in Mount Vernon?

In Mount Vernon, Alabama, in September, it is raining for 15.3 days, with typically 2.48" (63mm) of accumulated precipitation.

When it does not snow in Mount Vernon?

In Mount Vernon snow does not fall in March through December.

What is the average length of the day in September in Mount Vernon?

The average length of the day in September in Mount Vernon is 12.3h.

How long on average sun shines in September in Mount Vernon?

The average sunshine in September in Mount Vernon, Alabama, is 9.4h.

What is the UV index intensity in September in Mount Vernon?

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Mount Vernon, AL

Average temperature in September - Mount Vernon, AL
  • Average high temperature in September: 88.2°F

The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is January (58.5°F).

  • Average low temperature in September: 70.7°F

The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (41.9°F).

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Average pressure in September
Mount Vernon, AL

Average pressure in September - Mount Vernon, AL
  • Average pressure in September: 29.98"

The month with the highest atmospheric pressure is January (30.16").
Months with the lowest atmospheric pressure are June and August (29.97").

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Average wind speed in September
Mount Vernon, AL

Average wind speed in September - Mount Vernon, AL
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).

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Average humidity in September
Mount Vernon, AL

Average humidity in September - Mount Vernon, 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 (71%).

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Average rainfall in September
Mount Vernon, AL

Average rainfall in September - Mount Vernon, AL
  • Average rainfall in September: 2.48"

The wettest months (with the highest rainfall) are July and August (4.57").
The driest month (with the least rainfall) is November (1.65").

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Average rainfall days in September
Mount Vernon, AL

Average rainfall days in September - Mount Vernon, AL
  • Average rainfall days in September: 15.3 days

The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is November (6.6 days).

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Average snowfall in September
Mount Vernon, AL

Average snowfall in September - Mount Vernon, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.2").
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Mount Vernon, AL

Average snowfall days in September - Mount Vernon, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.3 days).
Months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Mount Vernon, AL

Average daylight in September / Average sunshine in September - Mount Vernon, AL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is June (Average sunshine: 10.9h).
The month with the least sunshine is December (Average sunshine: 5.2h).

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Average sunshine days in September
Mount Vernon, AL

Average sunshine days in September - Mount Vernon, AL
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is July (6.1 days).

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Average UV index in September
Mount Vernon, AL

Average UV index in September - Mount Vernon, AL
  • Average UV index in September: 6

Months with the highest UV index are May, June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 3).

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Average cloud cover in September
Mount Vernon, AL

Average cloud cover in September - Mount Vernon, AL
  • Average cloud cover in September: 28

The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is October (Cloud cover 25).

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Average visibility in September
Mount Vernon, AL

Average visibility in September - Mount Vernon, AL
  • Average visibility in September: 6mi

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

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