September weather forecast
South Sumter, SC

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Weather in September

September, the first month of the autumn in South Sumter, is also a moderately hot month, with an average temperature ranging between max 83.7°F (28.7°C) and min 66.6°F (19.2°C).

Temperature

The average high-temperature during September is a warm 83.7°F (28.7°C), almost matching the conditions of the preceding month. During September, the temperature tends to dip to an average of 66.6°F (19.2°C) at night.

Heat index

The heat index value for September is estimated at a tropical 91.4°F (33°C). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Note that heat index values are valued for light wind and location in the shade. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a composite of temperature and humidity figures to convey how warm it feels. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.

Humidity

The average relative humidity in September in South Sumter is 75%.

Rainfall

In September, the rain falls for 14.1 days. Throughout September, 2.48" (63mm) of precipitation is accumulated. Throughout the year, there are 161.8 rainfall days, and 33.35" (847mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In September, the average length of the day in South Sumter is 12h and 22min.
On the first day of September, sunrise is at 6:55 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:06 pm EDT.

Sunshine

In South Sumter, the average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 6 in September leads to these recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
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Frequently asked questions

How hot does it get in South Sumter in September?

The average high-temperature, in September, in South Sumter, is 83.7°F (28.7°C), while the average low-temperature is 66.6°F (19.2°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is estimated at 91.4°F (33°C).

What is the average humidity in September in South Sumter?

In South Sumter, South Carolina, the average relative humidity in September is 75%.

How many days does it rain in September in South Sumter?

In South Sumter, in September, during 14.1 rainfall days, 2.48" (63mm) of precipitation is typically accumulated.

When it does not snow in South Sumter?

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

What is the average length of the day in September in South Sumter?

In September, the average day length is 12h and 22min.

When is the sunrise / sunset in September in South Sumter?

In September, on the first day of the month, sunrise is at 6:55 am and sunset at 7:46 pm. On the last day of the month, in South Sumter, South Carolina, sunrise is at 7:15 am and sunset at 7:06 pm EDT.

How long on average sun shines in September in South Sumter?

In South Sumter, South Carolina, the average sunshine duration in September is 8.7h.

What is the UV index intensity in September in South Sumter?

In September, the average daily maximum UV index in South Sumter, South Carolina, is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
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
South Sumter, SC

Average temperature in September - South Sumter, SC
  • Average high temperature in September: 83.7°F

The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (52.9°F).

  • Average low temperature in September: 66.6°F

The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).

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Average pressure in September
South Sumter, SC

Average pressure in September - South Sumter, SC
  • Average pressure in September: 30.01"Hg

The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

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Average wind speed in September
South Sumter, SC

Average wind speed in September - South Sumter, SC
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are February and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in September
South Sumter, SC

Average humidity in September - South Sumter, SC
  • Average humidity in September: 75%

The month with the highest relative humidity is May (76%).
The months with the lowest relative humidity are January and November (70%).

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Average rainfall in September
South Sumter, SC

Average rainfall in September - South Sumter, SC
  • Average rainfall in September: 2.48"

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (1.89").

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Average rainfall days in September
South Sumter, SC

Average rainfall days in September - South Sumter, SC
  • Average rainfall days in September: 14.1 days

The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is October (8.5 days).

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Average snowfall in September
South Sumter, SC

Average snowfall in September - South Sumter, SC
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.55").
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
South Sumter, SC

Average snowfall days in September - South Sumter, SC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.6 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
South Sumter, SC

Average daylight in September / Average sunshine in September - South Sumter, 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: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

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Average sunshine days in September
South Sumter, SC

Average sunshine days in September - South Sumter, SC
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (8.8 days).

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Average UV index in September
South Sumter, SC

Average UV index in September - South Sumter, SC
  • Average UV index in September: 6

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).

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Average cloud cover in September
South Sumter, SC

Average cloud cover in September - South Sumter, SC
  • Average cloud cover in September: 33

The months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).

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Average visibility in September
South Sumter, SC

Average visibility in September - South Sumter, 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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South Sumter, South Carolina, USA

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