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

September implies a soft temperature shift, with average high-temperatures reducing from August's 84.2°F (29°C) to a still warm 78.8°F (26°C). With a notable disparity from daily peak temperatures, the average low-temperature settles at a refreshing 55.4°F (13°C) throughout September.

Rainfall

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

Daylight

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

Sunshine

In September, the average sunshine is 7h.

UV index

The average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: The daily high UV index of 7 in September translates into this advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. A hat with a broad brim is indispensable, filtering out up to half of UV rays.