September weather forecast and climate
Napier Field, AL

Weather in September

September, the first month of the autumn, in Napier Field, is still a tropical month, with average temperature fluctuating between 69.6°F (20.9°C) and 86.9°F (30.5°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still hot 86.9°F (30.5°C). In September, in Napier Field, the average low-temperature is 69.6°F (20.9°C).

Heat index

In September, the average heat index is calculated to a torrid 98.8°F (37.1°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 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, wind, pregnancy). 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. 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 exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

In September, in Napier Field, the rain falls for 13.7 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. Throughout the year, in Napier Field, there are 151.6 rainfall days, and 23.27" (591mm) of precipitation is accumulated.

Snowfall

In Napier Field snow does not fall in April through December.

Daylight

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

Sunshine

The average sunshine in Napier Field is 8.8h.

UV index

In Napier Field, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Napier Field?

In Napier Field, in September, the average high-temperature is 86.9°F (30.5°C), and the average low-temperature is 69.6°F (20.9°C). In September, 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, is appraised at 98.8°F (37.1°C).

What is the average humidity in September in Napier Field?

The average relative humidity in September is 73%.

How many days does it rain in September in Napier Field?

In Napier Field, Alabama, in September, during 13.7 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

When it does not snow in Napier Field?

In Napier Field snow does not fall in April through December.

How many hours of daylight does Napier Field have in September?

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

How long on average sun shines in September in Napier Field?

In September, the average sunshine in Napier Field, Alabama, is 8.8h.

How high is the UV index in September in Napier Field?

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

Average temperature in September
Napier Field, AL

Average temperature in September - Napier Field, AL
  • Average high temperature in September: 86.9°F

The warmest month (with the highest average high temperature) is July (90.9°F).
The month with the lowest average high temperature is January (57.7°F).

  • Average low temperature in September: 69.6°F

Months with the highest average low temperature are July and August (73.6°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

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Average pressure in September
Napier Field, AL

Average pressure in September - Napier Field, 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 (29.98").

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Average wind speed in September
Napier Field, AL

Average wind speed in September - Napier Field, AL
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

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Average humidity in September
Napier Field, AL

Average humidity in September - Napier Field, AL
  • Average humidity in September: 73%

Months with the highest relative humidity are August and December (75%).
Months with the lowest relative humidity are May and October (69%).

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Average rainfall in September
Napier Field, AL

Average rainfall in September - Napier Field, AL
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is November (1.22").

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Average rainfall days in September
Napier Field, AL

Average rainfall days in September - Napier Field, AL
  • Average rainfall days in September: 13.7 days

The month with the highest number of rainy days is August (20.7 days).
The month with the least rainy days is November (7.2 days).

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Average snowfall in September
Napier Field, AL

Average snowfall in September - Napier Field, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.16").
Months with the least snowfall are April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Napier Field, AL

Average snowfall days in September - Napier Field, 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, November and December (0 days).

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Average daylight in September /
Average sunshine in September
Napier Field, AL

Average daylight in September / Average sunshine in September - Napier Field, 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: 8.8h

Months with the most sunshine are June and July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 5.3h).

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Average sunshine days in September
Napier Field, AL

Average sunshine days in September - Napier Field, AL
  • Average sunshine days in September: 13.4 days

Months with the most sunshine days are October and November (21.1 days).
The month with the least sunshine days is August (7.2 days).

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Average UV index in September
Napier Field, AL

Average UV index in September - Napier Field, 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
Napier Field, AL

Average cloud cover in September - Napier Field, AL
  • Average cloud cover in September: 29

Months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 27).

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Average visibility in September
Napier Field, AL

Average visibility in September - Napier Field, 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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