September weather forecast
Whitehall Terrace, SC

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Weather in September

September, the first month of the autumn in Whitehall Terrace, is also a moderately hot month, with temperature in the range of an average low of 74.1°F (23.4°C) and an average high of 82.6°F (28.1°C).

Temperature

September registers an average high-temperature of a still warm 82.6°F (28.1°C), slightly varied from August's 85.8°F (29.9°C). The September nights show a slight decrease to a mean low-temperature of 74.1°F (23.4°C).

Heat index

September's mean heat index is estimated at a tropical 89.6°F (32°C). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.

Humidity

In September, the average relative humidity is 76%.

Rainfall

In September, the rain falls for 18.5 days. Throughout September, 5.67" (144mm) of precipitation is accumulated. Throughout the year, in Whitehall Terrace, there are 184.5 rainfall days, and 45.83" (1164mm) of precipitation is accumulated.

Snowfall

In Whitehall Terrace, snow does not fall in March through December.

Daylight

In Whitehall Terrace, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:54 am and sunset at 7:43 pm. On the last day of September, in Whitehall Terrace, sunrise is at 7:12 am and sunset at 7:04 pm EDT.

Sunshine

In Whitehall Terrace, South Carolina, the average sunshine in September is 9.2h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: A maximum high UV index of 6 in September translates into the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in September?

In September, the average high-temperature and low-temperature are 82.6°F (28.1°C) and 74.1°F (23.4°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in September is estimated at 89.6°F (32°C).

What is the average humidity in September in Whitehall Terrace?

In Whitehall Terrace, the average relative humidity in September is 76%.

How much does it rain in September?

In September, the rain falls for 18.5 days. Throughout September, 5.67" (144mm) of precipitation is accumulated.

When it does not snow?

March through December are months without snowfall.

How many hours of daylight does Whitehall Terrace have in September?

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

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:54 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:04 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September in Whitehall Terrace is 9.2h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from 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
Whitehall Terrace, SC

Average temperature in September - Whitehall Terrace, SC
  • Average high temperature in September: 82.6°F

The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (57°F).

  • Average low temperature in September: 74.1°F

The month with the highest average low temperature is July (78.4°F).
The coldest month (with the lowest average low temperature) is January (45.7°F).

Average pressure in September
Whitehall Terrace, SC

Average pressure in September - Whitehall Terrace, SC
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

Average wind speed in September
Whitehall Terrace, SC

Average wind speed in September - Whitehall Terrace, SC
  • Average wind speed in September: 9.4mph

The windiest months (with the highest average wind speed) are March and April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.6mph).

Average humidity in September
Whitehall Terrace, SC

Average humidity in September - Whitehall Terrace, SC
  • Average humidity in September: 76%

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (73%).

Average rainfall in September
Whitehall Terrace, SC

Average rainfall in September - Whitehall Terrace, SC
  • Average rainfall in September: 5.67"

The wettest month (with the highest rainfall) is August (7.83").
The driest month (with the least rainfall) is January (1.54").

Average rainfall days in September
Whitehall Terrace, SC

Average rainfall days in September - Whitehall Terrace, SC
  • Average rainfall days in September: 18.5 days

The month with the highest number of rainy days is August (25.2 days).
The month with the least rainy days is November (9.9 days).

Average snowfall in September
Whitehall Terrace, SC

Average snowfall in September - Whitehall Terrace, SC
  • Average snowfall in September: 0"

The months with the highest snowfall are January and February (0.04").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in September
Whitehall Terrace, SC

Average snowfall days in September - Whitehall Terrace, SC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.5 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in September /
Average sunshine in September
Whitehall Terrace, SC

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

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

Average sunshine days in September
Whitehall Terrace, SC

Average sunshine days in September - Whitehall Terrace, SC
  • Average sunshine days in September: 8.3 days

The month with the most sunshine days is January (18.1 days).
The month with the least sunshine days is August (2.5 days).

Average UV index in September
Whitehall Terrace, SC

Average UV index in September - Whitehall Terrace, SC
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

Average cloud cover in September
Whitehall Terrace, SC

Average cloud cover in September - Whitehall Terrace, SC
  • Average cloud cover in September: 28

The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is June (Cloud cover 25).

Average visibility in September
Whitehall Terrace, SC

Average visibility in September - Whitehall Terrace, 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).

Whitehall Terrace, South Carolina, USA

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