This report describes the typical weather at the Myrtle Beach International Airport (Myrtle Beach, South Carolina, United States) weather station over the course of an average July. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Myrtle Beach, South Carolina has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (42%), forests (31%), croplands (18%), and grasslands (7%).
The month of July is characterized by essentially constant daily high temperatures, with daily highs around 87°F throughout the month, exceeding 93°F or dropping below 82°F only one day in ten.
Over the course of July, the length of the day is gradually decreasing. The shortest day of the month is July 31 with 13:49 hours of daylight; the longest day is July 2 with 14:21 hours of daylight.
The earliest sunrise is at 6:09am on July 1; the latest sunset is at 8:30pm on July 2; the latest sunrise is at 6:27am on July 31; the earliest sunset is at 8:16pm on July 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in July, so the entire month is in daylight time.
The median cloud cover is 57% (partly cloudy) and does not vary substantially over the course of the month.
On July 16, a representative day, the sky is clear or mostly clear 29% of the time, partly cloudy 25% of the time, and mostly cloudy or overcast 39% of the time.
The average probability that some form of precipitation will be observed in a given day is 43%, with little variation over the course of the month.
Throughout July, the most common forms of precipitation are thunderstorms and light rain.
Thunderstorms are the most severe precipitation observed during 72% of those days with precipitation. They are most likely around July 29, when it is observed during 32% of all days.
Light rain is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around July 4, when it is observed during 9% of all days.
Either snow is exceptionally unlikely to fall at this location in July or this station does not reliably report precipitation types.
The relative humidity typically ranges from 59% (mildly humid) to 92% (very humid) over the course of a typical July, rarely dropping below 45% (comfortable) and reaching as high as 100% (very humid).
The air is driest around July 1, at which time the relative humidity drops below 67% (mildly humid) three days out of four; it is most humid around July 22, rising above 88% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical July, the dew point typically varies from 67°F (muggy) to 76°F (oppressive) and is rarely below 60°F (comfortable) or above 80°F (very oppressive).
Over the course of July typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around July 3, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around July 31, at which time the average daily maximum wind speed is 13 mph (moderate breeze).