September weather forecastKiawah Island, SC
September
Weather in September
September in Kiawah Island witnesses a drop in temperature and rainfall from August. The wind picks up slightly, making the outdoors more comfortable. The days gradually become shorter, signaling the onset of fall. Ample sunshine keeps the Island alive, spelling favorable conditions for various events and festivities.Temperature
Kiawah Island experiences a recorded average high-temperature of a moderately hot 82.6°F (28.1°C) in September, closely aligned with August's 86°F (30°C). Nighttime temperatures record an average of 74.3°F (23.5°C) throughout September.Heat index
September's heat index is computed to be a tropical 89.6°F (32°C). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.In the scope of the heat index, its values resonate with shade and light wind conditions. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular importance for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Humidity
In September, the average relative humidity is 76%.Rainfall
In Kiawah Island, in September, during 11.3 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Kiawah Island, during the entire year, the rain falls for 113.3 days and collects up to 10" (254mm) of precipitation.Snowfall
In Kiawah Island, snow does not fall in February through November.Daylight
The average length of the day in September 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 Kiawah Island, the average sunshine in September is 9.1h.UV index
In Kiawah Island, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 6 during September translates into the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kiawah Island, 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: 74.3°F
The months with the highest average low temperature are July and August (78.4°F).
The coldest month (with the lowest average low temperature) is January (46.4°F).
Average pressure in September
Kiawah Island, 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
Kiawah Island, SC
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (8.8mph).
Average humidity in September
Kiawah Island, 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, March and October (73%).
Average rainfall in September
Kiawah Island, SC
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is August (1.93").
The driest month (with the least rainfall) is January (0.24").
Average rainfall days in September
Kiawah Island, SC
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is August (17.3 days).
The month with the least rainy days is November (5.2 days).
Average snowfall days in September
Kiawah Island, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Kiawah Island, SC
- Average daylight in September: 12h and 24min
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 6min
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
Kiawah Island, SC
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is January (23.9 days).
The month with the least sunshine days is August (8.5 days).
Average UV index in September
Kiawah Island, 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
Kiawah Island, SC
- Average cloud cover in September: 29
The month with the most cloud cover is December (Cloud cover 39).
The months with the least cloud cover are June and July (Cloud cover 25).
Average visibility in September
Kiawah Island, 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).
