September weather forecast
North Charleston, SC

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Weather in September

September brings the beginning of fall to North Charleston, introducing the initial stages of the cooling trend. The temperatures lessen compared to the summer months, with the highest reaching 84.4°F (29.1°C) and the lowest dipping down to 72°F (22.2°C). As summer makes way for fall, September’s weather showcases moderate temperatures in comparison to August, and even cooler days anticipated in October. A drop in the UV index and extended daylight hours, complement the pleasant temperatures, making outdoor activities enjoyable.

Temperature

North Charleston's weather in September, with an average high-temperature of a moderately hot 84.4°F (29.1°C), subtly shifts from August's 88.3°F (31.3°C). During the nights in September, North Charleston experiences a consistent average temperature of 72°F (22.2°C).

Heat index

September's heat index is estimated at a tropical 93.2°F (34°C). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In September, the average relative humidity is 75%.

Rainfall

In September, the rain falls for 14.8 days. Throughout September, 2.76" (70mm) of precipitation is accumulated. Throughout the year, there are 154.4 rainfall days, and 23.43" (595mm) of precipitation is accumulated.

Snowfall

March through November are months without snowfall.

Daylight

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 7:44 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:05 pm EDT.

Sunshine

In North Charleston, the average sunshine in September is 9h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A typical high UV index of 6 in September suggests the following recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.

Frequently asked questions

Is it hot during September?

September temperatures vary between a high-temperature of 84.4°F (29.1°C) and a low-temperature of 72°F (22.2°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is estimated at 93.2°F (34°C).

What is the average humidity in September?

In North Charleston, the average relative humidity in September is 75%.

How much does it rain in September?

In North Charleston, in September, during 14.8 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

When it does not snow in North Charleston?

March through November are months without snowfall.

How many hours of daylight does North Charleston have in September?

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

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:54 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:05 pm EDT.

How many hours of sunshine does North Charleston have in September?

In September, the average sunshine duration is 9h.

How high is the UV index in September?

In North Charleston, the average daily maximum UV index in September 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 days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
North Charleston, SC

Average temperature in September - North Charleston, SC
  • Average high temperature in September: 84.4°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 (56.8°F).

  • Average low temperature in September: 72°F

The month with the highest average low temperature is July (76.5°F).
The coldest month (with the lowest average low temperature) is January (42.8°F).

Average pressure in September
North Charleston, SC

Average pressure in September - North Charleston, 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
North Charleston, SC

Average wind speed in September - North Charleston, SC
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in September
North Charleston, SC

Average humidity in September - North Charleston, SC
  • Average humidity in September: 75%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (72%).

Average rainfall in September
North Charleston, SC

Average rainfall in September - North Charleston, SC
  • Average rainfall in September: 2.76"

The wettest month (with the highest rainfall) is August (4.29").
The driest month (with the least rainfall) is January (0.67").

Average rainfall days in September
North Charleston, SC

Average rainfall days in September - North Charleston, SC
  • Average rainfall days in September: 14.8 days

The month with the highest number of rainy days is August (22.7 days).
The month with the least rainy days is November (6.9 days).

Average snowfall days in September
North Charleston, SC

Average snowfall days in September - North Charleston, SC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average daylight in September /
Average sunshine in September
North Charleston, SC

Average daylight in September / Average sunshine in September - North Charleston, 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 0min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

Average sunshine days in September
North Charleston, SC

Average sunshine days in September - North Charleston, SC
  • Average sunshine days in September: 11 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (6.1 days).

Average UV index in September
North Charleston, SC

Average UV index in September - North Charleston, SC
  • Average UV index in September: 6

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

Average cloud cover in September
North Charleston, SC

Average cloud cover in September - North Charleston, SC
  • Average cloud cover in September: 30

The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are June and July (Cloud cover 26).

Average visibility in September
North Charleston, SC

Average visibility in September - North Charleston, 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).

North Charleston, South Carolina, USA

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