September weather forecastClemson, SC
September
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
September's arrival registers an average high-temperature of a warm 82.8°F (28.2°C), closely aligning with the temperature of the previous month. Clemson's temperature lowers to a mean of 62.1°F (16.7°C) during the nights in September.Heat index
September's average heat index is evaluated at a tropical 87.8°F (31°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.Understanding the heat index involves considering values for shaded locales with light wind. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
Humidity
In Clemson, the average relative humidity in September 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
In Clemson, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 7:04 am and sunset at 7:57 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:16 pm EDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In Clemson, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 5 in September translates into these instructions:
Exercise prevention - Precautions against solar damage are endorsed. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Clemson, SC
- Average daylight in September: 12h and 24min
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 42min
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).
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).
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).
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).
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).
