September weather forecast
Clemson, SC

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Weather in September

September marks the onset of fall in Clemson, South Carolina, offering a respite from the heights of summer with its highs of 82.8°F (28.2°C). Landscapes begin to convert into colorful canvases filled with hues of orange, red, and yellow. The climate gradually cools down from summer's peak of heat, offering a comfortable environment for outdoor activities. Pumpkin patches and apple orchards popularly represent this period. Showery days, although fewer than those in summer, contribute to maintaining the lushness of the city.

Temperature

Clemson marks the arrival of September with an average high-temperature of a moderately hot 82.8°F (28.2°C), hardly different from August's 88°F (31.1°C). September is noted for a mean low-temperature of 62.1°F (16.7°C).

Heat index

In September, the average heat index is calculated to be a hot 87.8°F (31°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.

Humidity

The average relative humidity in September in Clemson is 72%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 1.73" (44mm) of precipitation.

Snowfall

In Clemson, snow does not fall in April through October.

Daylight

The average length of the day in September in Clemson is 12h and 23min.
On the first day of September in Clemson, South Carolina, sunrise is at 7:04 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:16 pm EDT.

Sunshine

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

UV index

In September, the average daily maximum UV index in Clemson, South Carolina, is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: An average UV index of 5 in September transforms into this advice:
Take necessary precautions - Defending against sun damage is advocated. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
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Frequently asked questions

How hot is it in Clemson in September?

An average high-temperature, in September, in Clemson, is 82.8°F (28.2°C) and the average low-temperature is 62.1°F (16.7°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 87.8°F (31°C).

What is the average humidity in September in Clemson?

In Clemson, South Carolina, the average relative humidity in September is 72%.

What is the driest month in Clemson?

The month with the least rainfall in Clemson, South Carolina, is September, when the rain falls for 12.5 days and typically collects 1.73" (44mm) of precipitation.

How much does it rain in Clemson in September?

In Clemson, South Carolina, in September, during 12.5 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow in Clemson?

In Clemson, South Carolina, snow does not fall in April through October.

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

The average day length in September in Clemson is 12h and 23min.

What time are sunrise and sunset in September in Clemson?

In September, on the first day of the month, sunrise is at 7:04 am and sunset at 7:57 pm. On the last day of the month, in Clemson, sunrise is at 7:25 am and sunset at 7:16 pm EDT.

How long on average sun shines in September in Clemson?

The average sunshine duration in September in Clemson, South Carolina, is 8.7h.

What is the UV index intensity in September in Clemson?

In Clemson, South Carolina, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Clemson, SC

Average temperature in September - Clemson, SC
  • Average high temperature in September: 82.8°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (49.6°F).

  • Average low temperature in September: 62.1°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).

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Average pressure in September
Clemson, SC

Average pressure in September - Clemson, SC
  • Average pressure in September: 30.03"Hg

The months with the highest atmospheric pressure are January and November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).

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Average wind speed in September
Clemson, SC

Average wind speed in September - Clemson, SC
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is February (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

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Average humidity in September
Clemson, SC

Average humidity in September - Clemson, SC
  • Average humidity in September: 72%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in September
Clemson, SC

Average rainfall in September - Clemson, SC
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is December (4.21").
The driest month (with the least rainfall) is September (1.73").

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Average rainfall days in September
Clemson, SC

Average rainfall days in September - Clemson, SC
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is October (9.5 days).

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Average snowfall in September
Clemson, SC

Average snowfall in September - Clemson, SC
  • Average snowfall in September: 0"

The month with the highest snowfall is December (2.05").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Clemson, SC

Average snowfall days in September - Clemson, SC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1.4 days).
The 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
Clemson, SC

Average daylight in September / Average sunshine in September - Clemson, SC
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Clemson, SC

Average sunshine days in September - Clemson, SC
  • Average sunshine days in September: 15.3 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (10.5 days).

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Average UV index in September
Clemson, SC

Average UV index in September - Clemson, SC
  • Average UV index in September: 5

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Clemson, SC

Average cloud cover in September - Clemson, SC
  • Average cloud cover in September: 30

The months with the most cloud cover are February and December (Cloud cover 41).
The months with the least cloud cover are June and July (Cloud cover 27).

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Average visibility in September
Clemson, SC

Average visibility in September - Clemson, SC
  • Average visibility in September: 6mi

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

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Clemson, South Carolina, USA

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