Myrtle Beach Weather in September

The hot summer weather at Myrtle Beach in South Carolina continues right into September.

This page gives detailed information on the typical September weather for Myrtle Beach.

You can jump directly to data and descriptions for:

The temperature and rainfall numbers here are historical averages based on climate data gathered at Myrtle Beach. The sunshine and humidity measurements are averages from the Charleston International Airport located south along the coast in North Charleston, SC. This weather station has a climate similar to Myrtle Beach and is the closest one that collects sun and humidity information for the National Climatic Data Center.

Temperature Weather iconTemperature

84 °F September average high 29 °C
64 °F September average low 18 °C

In most years, Myrtle Beach averages a daily maximum temperature for September that's between 82 and 85 degrees Fahrenheit (28 to 30 degrees Celsius). The minimum temperature usually falls between 61 and 66 °F (16 to 19 °C).

The days at Myrtle Beach begin to cool down quickly during September. By the end of the month, the temperature has dropped around 6 °F (3 °C) below what it was at the start.

24 days 80 °F max. or more (27 °C)
25 days 70 °F min. or less (21 °C)

Usually every day in September warms to over 70 °F (21 °C) in Myrtle Beach. The city averages 2 days this month when the thermometer reaches into the 90s °F (over 32 °C). Temperatures above 100 °F (38 °C) are not expected here during September.

The thermometer dips to 60 °F (16 °C) or below on an average of 8 nights. But September only rarely gets as cold as 50 °F (10 °C).

Rainy Weather iconRain

6.1 in total precipitation 154 mm
8 days of rain

September is rainier than most months at Myrtle Beach.

Sunny Weather iconSun

61 % sunshine
7 days clear skies

The sun's rays reach the ground in Myrtle Beach during 61 percent of daylight hours on average in September, for a total of 226 hours in the month. Typically on 7 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in September at the seaside city lasts for 12 hours and 21 minutes a day on average. The longest day of the month is the 1st with 12 hours and 51 minutes of daylight. By the end of the month, the days have shortened to 11:52 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

78 % September average humidity

The relative humidity in Myrtle Beach during September usually peaks at 90 percent in the morning then drops to 61 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 89 90 89 70 61 63 77 86

Stormy Weather iconStorms

12 % chance a named storm approaches

There's a 6 percent probability that a hurricane will approach within 100 miles (165 km) of Myrtle Beach during September. The chance of a major category 3 to 5 hurricane reaching the area is 2 percent.


These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity statistics are 1961-1990 normals. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.

Myrtle Beach Weather
Back to Top