Myrtle Beach Weather Averages
Myrtle Beach in South Carolina enjoys mild temperatures for most of the year. Summer is the rainiest time of year, while spring and fall are the driest. In any month though, most days at this destination city have no rain.
This page gives detailed information on the annual temperature, precipitation, sun, humidity, wind 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.
|73 °F||annual average high||23 °C|
|55 °F||annual average low||13 °C|
Myrtle Beach's coldest days of the year usually occur in mid January when the daily maximum temperature averages 55 degrees Fahrenheit (13 degrees Celsius) and the minimum averages 36 °F (2 °C).
The year's hottest days are normally in July. The average temperature peaks then with daily highs of 88 °F (31 °C) and nighttime lows of 74 °F (23 °C).
|229 days||70 °F max. or more (21 °C)|
|34 days||32 °F min. or less (0 °C)|
Myrtle Beach averages 21 days a year when the thermometer reaches into the 90s °F (over 32 °C). But the temperature doesn't normally climb into the 100s Fahrenheit (above 38 °C).
The temperature dips to 20 °F (-8 °C) or below on an average of 2 nights a year. But Myrtle Beach doesn't normally get as cold as 10 °F (-12 °C).
|48.5 in||total precipitation||1231 mm|
|122 days||of rain or snowfall|
August and September are usually the wettest months of the year in Myrtle Beach, while January, April and May are the driest.
|102 days||clear skies|
The sun's rays reach the ground in Myrtle Beach during 63 percent of daylight hours on average year round, for a total of 2800 hours annually. Typically on 102 days a year the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight at the popular holiday spot averages 12 hours and 10 minutes a day. The shortest days of the year in mid December have 9 hours and 55 minutes of daylight. The year's longest days in mid June last 14:24 from sunrise to sunset.
|73 %||average humidity|
The annual average for relative humidity in Myrtle Beach ranges throughout the day from 85 percent at 4:00 am to 55 percent at 1:00 pm standard time.
|Local Time||1 am||4 am||7 am||10 am||1 pm||4 pm||7 pm||10 pm|
|13 days||rainfall of 1 inch (25 mm) or more|
|4 %||chance a named storm makes landfall|
In any year, there's a 2 percent probability that a hurricane will reach land in Horry county, which includes Myrtle Beach. For major hurricanes of category 3 to 5, the likelihood drops to less than one percent. Named storms usually arrive during the months of June to November, while hurricanes are generally restricted to August, September and October.
The chances that a wind gust reaches 40 miles per hour (64 kilometres an hour) or greater is 24 percent a year. Intense hurricane force winds that top 115 mph (185 kph) have a 2 percent probability of blasting the county.
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 and wind gust probability information comes from United States Landfalling Hurricane Probability Project of Colorado State University and Bridgewater State University.