September weather forecast and climate
Harpersville, AL

Weather in September

September, the first month of the autumn, in Harpersville, is still a warm month, with temperature in the range of an average high of 84.7°F (29.3°C) and an average low of 65.1°F (18.4°C).

Temperature

In September, the average high-temperature is almost the same as in August - a warm 84.7°F (29.3°C). The average low-temperature, in Harpersville, is 65.1°F (18.4°C).

Heat index

In September, the average heat index is calculated to a tropical 93.6°F (34.2°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', 'feels like', 'felt air temperature', or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like differences in body mass, height, and shape, wind, clothing, and activity influence one's weather impression. 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. 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

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

Rainfall

In Harpersville, in September, during 14 rainfall days, 2.52" (64mm) of precipitation is typically accumulated. In Harpersville, during the entire year, the rain falls for 177.1 days and collects up to 41.06" (1043mm) of precipitation.

Snowfall

In Harpersville snow does not fall in April through October.

Daylight

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

Sunshine

In September, the average sunshine in Harpersville is 8.7h.

UV index

In September, the average daily maximum UV index in Harpersville is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.
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FAQ

What is the temperature in September in Harpersville?

In Harpersville, Alabama, in September, the average high-temperature is 84.7°F (29.3°C), and the average low-temperature is 65.1°F (18.4°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines relative humidity and air temperature, is evaluated at 93.6°F (34.2°C).

What is the average humidity in September in Harpersville?

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

How many days does it rain in September in Harpersville?

In Harpersville, Alabama, in September, it is raining for 14 days, with typically 2.52" (64mm) of accumulated precipitation.

When it does not snow in Harpersville?

In Harpersville, Alabama, snow does not fall in April through October.

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

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

How long on average sun shines in September in Harpersville?

The average sunshine in September in Harpersville is 8.7h.

How high is the UV index in September in Harpersville?

In Harpersville, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Harpersville, AL

Average temperature in September - Harpersville, AL
  • Average high temperature in September: 84.7°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (50.9°F).

  • Average low temperature in September: 65.1°F

The month with the highest average low temperature is July (70.2°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).

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Average pressure in September
Harpersville, AL

Average pressure in September - Harpersville, AL
  • Average pressure in September: 30.01"

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
Harpersville, AL

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

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 (4.2mph).

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Average humidity in September
Harpersville, AL

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

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Harpersville, AL

Average rainfall in September - Harpersville, AL
  • Average rainfall in September: 2.52"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is October (2.28").

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Average rainfall days in September
Harpersville, AL

Average rainfall days in September - Harpersville, AL
  • Average rainfall days in September: 14 days

The month with the highest number of rainy days is July (21.7 days).
The month with the least rainy days is November (8.4 days).

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Average snowfall in September
Harpersville, AL

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

The month with the highest snowfall is January (0.83").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Harpersville, AL

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

Months with the highest number of snowfall days are January and February (1.3 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Harpersville, AL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 8.7h

Months with the most sunshine are June and July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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Average sunshine days in September
Harpersville, AL

Average sunshine days in September - Harpersville, AL
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is October (19.3 days).
The month with the least sunshine days is July (6.9 days).

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Average UV index in September
Harpersville, AL

Average UV index in September - Harpersville, 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, February and December (UV index 3).

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Average cloud cover in September
Harpersville, AL

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

The month with the most cloud cover is February (Cloud cover 48).
Months with the least cloud cover are June, September and October (Cloud cover 31).

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Average visibility in September
Harpersville, AL

Average visibility in September - Harpersville, 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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