September weather forecast and climate
Penn, AL

Weather in September

The first month of the autumn, September, is also a moderately hot month in Penn, Alabama, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 83.3°F (28.5°C).

Temperature

In September, the average high-temperature is practically the same as in August - a moderately hot 83.3°F (28.5°C). The average low-temperature, is 64°F (17.8°C).

Heat index

In September, the average heat index is estimated at a tropical 90.1°F (32.3°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values 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 calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, differences in body mass, height, and shape, pregnancy, and clothing affect individual temperature impact. 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 particularly important for children. 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.

Humidity

In Penn, the average relative humidity in September is 74%.

Rainfall

In Penn, Alabama, it is raining for 13.7 days, with typically 2.48" (63mm) of accumulated precipitation. Throughout the year, there are 173 rainfall days, and 41.38" (1051mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Penn.

Daylight

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

Sunshine

The average sunshine in September is 8.8h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Penn?

In Penn, in September, the average high-temperature is 83.3°F (28.5°C), and the average low-temperature is 64°F (17.8°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that represents influence of the relative humidity to air temperaure, is appraised at 90.1°F (32.3°C).

What is the average humidity in September in Penn?

The average relative humidity in September in Penn, Alabama, is 74%.

How much does it rain in Penn in September?

In Penn, Alabama, in September, during 13.7 rainfall days, 2.48" (63mm) of precipitation is typically accumulated.

When it does not snow in Penn?

April through October are months without snowfall in Penn, Alabama.

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

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

How long on average sun shines in September in Penn?

The average sunshine in September in Penn, Alabama, is 8.8h.

What is the UV index intensity in September in Penn?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Penn, AL

Average temperature in September - Penn, AL
  • Average high temperature in September: 83.3°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (48.7°F).

  • Average low temperature in September: 64°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).

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Average pressure in September
Penn, AL

Average pressure in September - Penn, 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").

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Average wind speed in September
Penn, AL

Average wind speed in September - Penn, AL
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is February (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in September
Penn, AL

Average humidity in September - Penn, AL
  • Average humidity in September: 74%

The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Penn, AL

Average rainfall in September - Penn, AL
  • Average rainfall in September: 2.48"

The wettest month (with the highest rainfall) is December (4.25").
The driest month (with the least rainfall) is November (2.24").

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Average rainfall days in September
Penn, AL

Average rainfall days in September - Penn, AL
  • Average rainfall days in September: 13.7 days

The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is November (9.7 days).

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Average snowfall in September
Penn, AL

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

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

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Average snowfall days in September
Penn, AL

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

The month with the highest number of snowfall days is February (2.1 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Penn, AL

Average daylight in September / Average sunshine in September - Penn, 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: 8.8h

The month with the most sunshine is June (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days in September
Penn, AL

Average sunshine days in September - Penn, AL
  • Average sunshine days in September: 14.4 days

The month with the most sunshine days is October (19.4 days).
The month with the least sunshine days is July (9.3 days).

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Average UV index in September
Penn, AL

Average UV index in September - Penn, 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).

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Average cloud cover in September
Penn, AL

Average cloud cover in September - Penn, AL
  • Average cloud cover in September: 31

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 30).

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Average visibility in September
Penn, AL

Average visibility in September - Penn, 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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