Myrtle Beach Weather in August

August continues the hot summer temperatures at Myrtle Beach, South Carolina. For most of the month this vacation destination enjoys sunny and dry weather.

This page gives detailed information on the typical August temperature, precipitation, sun, humidity and storms for Myrtle Beach. The temperature and rainfall numbers here are historical averages based on climate data gathered at Grand Strand Airport. The sunshine and humidity measurements are averages from Charleston International Airport.

Temperature Weather iconTemperature

87 °F August average high 30 °C
73 °F August average low 23 °C
6 days 90 °F max. or more (32 °C)
7 days 70 °F min. or less (21 °C)

Nearly every day in August warms to over 80 degrees Fahrenheit (27 degrees Celsius) in Myrtle Beach. Temperatures above 100 °F (38 °C) are not expected here this month.

Most years, the nights in August never cool down below 60 °F (16 °C).

Rainy Weather iconRain

6.3 in total precipitation 159 mm
12 days of rain

Half the time, Myrtle Beach receives 4.0 to 7.5 inches (101 to 191 mm) of rainfall in August. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

64 % sunshine
6 days clear skies

The sun's rays reach the ground in Myrtle Beach during 64 percent of daylight hours on average in August, for a total of 265 hours in the month. Typically on 6 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in August at the resort city lasts for 13 hours and 21 minutes a day on average. The longest day of the month is the 1st with 13 hours and 48 minutes of daylight. By the end of the month, the days have shortened to 12:53 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

79 % August average humidity

The relative humidity in Myrtle Beach during August usually peaks at 91 percent in the morning then drops to 63 percent by early afternoon. This is the most humid month for the vacation city.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 89 91 89 71 63 66 77 86

Stormy Weather iconStorms

4 days rainfall of 0.5 inches (13 mm) or more
10 % chance a named storm approaches

There's a 4 percent probability that a hurricane will approach within 100 miles (165 km) of Myrtle Beach during August. The chance of a major hurricane (category 3 to 5) reaching the area is 1 percent.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.

Myrtle Beach Weather
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