September weather forecastMyrtle Beach, SC
September
Weather in September
September marks the end of summer and the onset of fall in Myrtle Beach, South Carolina, accompanied by a noticeable drop in temperature compared to August. Average highs fall to 81.7°F (27.6°C) while the lows hit 71.4°F (21.9°C). Precipitation levels begin their descent registering at about 3.35" (85mm) spread across roughly 15.6 days. The shift into October brings further reduction in temperatures and rainfall, marking significant changes in the city's weather pattern. Despite the change in season, September still boasts relatively warm weather, high UV index and pleasant sea temperatures, extending the beach-going season.Temperature
Upon the onset of September, Myrtle Beach witnesses an average high-temperature of a still warm 81.7°F (27.6°C), showing a close resemblance to the prior month. During the month of September, Myrtle Beach anticipates a mean low-temperature of 71.4°F (21.9°C).Heat index
In September, the heat index is evaluated at a tropical 87.8°F (31°C). With ongoing exposure and activity, one might experience weariness, and heat cramps could ensue.Given the heat index, its values are aligned with shaded sites and gentle winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', blends air temperature and moisture content to represent the felt temperature to humans. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Humidity
The average relative humidity in September is 77%.Rainfall
In September, the rain falls for 15.6 days. Throughout September, 3.35" (85mm) of precipitation is accumulated. Throughout the year, there are 166.5 rainfall days, and 28.78" (731mm) of precipitation is accumulated.Snowfall
March through November are months without snowfall.Ocean temperature
In Myrtle Beach, in September, the average water temperature is 80.6°F (27°C).Note: A water temperature from 77°F (25°C) to 84.2°F (29°C) is considered very warm and enjoyable, allowing water activities to be pleasant for extended periods without irritation.
Daylight
In Myrtle Beach, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:09 am and sunset at 7:00 pm EDT.
Sunshine
The average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 6 during September translates into these guidelines:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Watch out! Sand and water enhance the UV exposure you receive.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Myrtle Beach, SC
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (54.3°F).
- Average low temperature in September: 71.4°F
The month with the highest average low temperature is July (76.3°F).
The coldest month (with the lowest average low temperature) is January (42.1°F).
Average pressure in September
Myrtle Beach, SC
- Average pressure in September: 30"Hg
The months with the highest atmospheric pressure are January and December (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Myrtle Beach, SC
- Average wind speed in September: 8.9mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (7.9mph).
Average humidity in September
Myrtle Beach, SC
- Average humidity in September: 77%
The months with the highest relative humidity are May, June, August and December (78%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall in September
Myrtle Beach, SC
- Average rainfall in September: 3.35"
The wettest month (with the highest rainfall) is August (4.53").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days in September
Myrtle Beach, SC
- Average rainfall days in September: 15.6 days
The months with the highest number of rainy days are July and August (19.8 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in September
Myrtle Beach, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Myrtle Beach, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Myrtle Beach, SC
- Average sea temperature in September: 80.5°F
The best month for swimming (with the highest average sea temperature) is August (82.9°F).
The coldest month (with the lowest average sea temperature) is March (57.7°F).
Average daylight in September /
Average sunshine in September
Myrtle Beach, SC
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 30min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Myrtle Beach, SC
- Average sunshine days in September: 12.1 days
The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is June (8.2 days).
Average UV index in September
Myrtle Beach, SC
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in September
Myrtle Beach, SC
- Average cloud cover in September: 29
The months with the most cloud cover are February and December (Cloud cover 40).
The month with the least cloud cover is June (Cloud cover 25).
Average visibility in September
Myrtle Beach, 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).
