September weather forecast
North Charleston, SC

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

The ushering in of September brings an average high-temperature of a moderately hot 84.4°F (29.1°C), closely mirroring the 88.3°F (31.3°C) of August. North Charleston throughout September, experiences an average nighttime temperature of 72°F (22.2°C).

Heat index

In September, the average heat index is computed to be a hot 93.2°F (34°C). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.

Humidity

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

Rainfall

In North Charleston, South Carolina, during September, the rain falls for 14.8 days and regularly aggregates up to 2.76" (70mm) of precipitation. In North Charleston, during the entire year, the rain falls for 154.4 days and collects up to 23.43" (595mm) of precipitation.

Snowfall

In North Charleston, snow does not fall in March through November.

Daylight

The average length of the day in September in North Charleston is 12h and 22min.
On the first day of September in North Charleston, 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.

Sunshine

The average sunshine in September is 9h.

UV index

In North Charleston, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 6 during September translates into these guidelines:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.