September weather forecast
Charleston International Airport, SC

September signifies a transition from the sweltering summer to the cooler autumn months in Charleston. The month is noted for a deceleration in temperature, standing at a comfortable high of 79°F (26.1°C). Rainfall continues its recess, whereas the UV index takes a setback, denoting the lessened sunlight hours. Despite the decrease in temperature, the weather remains warm and agreeable for outdoor indulgence. The anticipation of the leaf-color changes already starts to invigorate the atmosphere.

Temperature

With September's onset, the weather reveals a slight temperature decrease, transitioning from a moderately hot 84.2°F (29°C) in August to a still warm 78.8°F (26°C). Charleston International Airport's average low-temperature for the month of September denotes a significant decline from the daily high, recording at a refreshing 55.4°F (13°C).

Rainfall

In September, the rain falls for 10 days. Throughout September, 3.43" (87mm) of precipitation is accumulated. In Charleston International Airport, during the entire year, the rain falls for 151 days and collects up to 41.93" (1065mm) of precipitation.

Daylight

In September, the average length of the day in Charleston International Airport is 12h and 22min.
On the first day of the month, sunrise is at 6:55 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:05 pm EDT.

Sunshine

In September, the average sunshine in Charleston International Airport is 7h.

UV index

In September, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: An average UV index of 7 in September transforms into this advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.