August weather forecastMyrtle Beach, SC

Weather in August

August unfolds a tad cooler than July in Myrtle Beach, South Carolina but continues to exhibit a palpable summer vibe. This month is characterized by a slight drop in temperature with highs at an average of 85.6°F (29.8°C) and a low at 75.6°F (24.2°C). August holds the record for the most rainfall throughout the year, with a total of 4.53" (115mm) dispersed over approximately 19.8 days. As summer draws to a close, the transition into September is marked by a significant reduction in temperature and a drop in precipitation. Despite the slight downturn in the weather, August still offers ideal conditions for beach visits and other outdoor activities.

Temperature

Welcoming August, Myrtle Beach notes an average high-temperature of a moderately hot 85.6°F (29.8°C), nearly consistent with July's 86.7°F (30.4°C). The average temperature during August nights is registered at 75.6°F (24.2°C).

Heat index

The heat index in August is evaluated at a very hot 98.6°F (37°C). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Be aware that heat index ratings are designed for shaded locations and minor breezes. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

May, June, August and December, with an average relative humidity of 78%, are the most humid months.

Rainfall

August is the month with the most rainfall. Rain falls for 19.8 days and accumulates 4.53" (115mm) of precipitation.

Snowfall

March through November are months without snowfall.

Ocean temperature

August is the month with the warmest seawater, with an average ocean temperature of 82.9°F (28.3°C).
Note: For activities such as swimming and diving, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as particularly pleasant and satisfying for prolonged periods without feeling uneasy.

Daylight

In August, the average length of the day is 13h and 22min.
On the first day of August, sunrise is at 6:28 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 7:42 pm EDT.

Sunshine

The months with the most sunshine are July and August, with an average of 10.9h of sunshine.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high daily UV index of 7 during August translates into the following directions:
Deter overexposure. Protecting against the sun's effects is essential. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.