This report describes the typical weather at the Ocean City Municipal Airport (Ocean City, Maryland, United States) weather station over the course of an average September. It is based on the historical records from 2000 to 2012. Earlier records are either unavailable or unreliable.
Ocean City, Maryland 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 (59%), croplands (28%), and forests (13%).
The month of September is characterized by falling daily high temperatures, with daily highs decreasing from 80°F to 73°F over the course of the month, exceeding 85°F or dropping below 68°F only one day in ten.
Over the course of September, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:10 hours, implying an average day-over-day decrease of 2.3 minutes.
The shortest day of the month is September 30 with 11:49 hours of daylight; the longest day is September 1 with 12:59 hours of daylight.
The earliest sunrise is at 6:31am on September 1; the latest sunset is at 7:30pm on September 1; the latest sunrise is at 6:56am on September 30; the earliest sunset is at 6:45pm on September 30.
Daylight saving time is observed in 2012 but it neither starts nor ends in September, so the entire month is in daylight time.
The median cloud cover ranges from 14% (mostly clear) to 22% (mostly clear). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 8% from the start to the end of the month.
On September 15, a representative day, the sky is clear or mostly clear 56% of the time, partly cloudy 4% of the time, and mostly cloudy or overcast 28% of the time.
The average probability that some form of precipitation will be observed in a given day is 29%, with little variation over the course of the month.
Throughout September, the most common forms of precipitation are light rain, heavy rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 35% of those days with precipitation. It is most likely around September 27, when it is observed during 11% of all days.
Heavy rain is the most severe precipitation observed during 23% of those days with precipitation. It is most likely around September 30, when it is observed during 8% of all days.
Thunderstorms are the most severe precipitation observed during 21% of those days with precipitation. They are most likely around September 1, when it is observed during 10% of all days.
Moderate rain is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around September 28, when it is observed during 7% of all days.
Either snow is exceptionally unlikely to fall at this location in September or this station does not reliably report precipitation types.
The relative humidity typically ranges from 61% (mildly humid) to 93% (very humid) over the course of a typical September, rarely dropping below 42% (comfortable) and reaching as high as 100% (very humid).
The air is driest around September 29, at which time the relative humidity drops below 71% (humid) three days out of four; it is most humid around September 30, rising above 90% (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 September, the dew point typically varies from 54°F (very comfortable) to 70°F (muggy) and is rarely below 44°F (dry) or above 75°F (very muggy).
Over the course of September typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 18 mph (fresh breeze).
The highest average wind speed of 8 mph (light breeze) occurs around September 19, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around September 1, at which time the average daily maximum wind speed is 12 mph (moderate breeze).