This report describes the typical weather at the South Padre Island (South Padre Island, Texas, United States) weather station over the course of an average September. It is based on the historical records from 2010 to 2013. Earlier records are either unavailable or unreliable.
South Padre Island, Texas 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 (63%), grasslands (26%), marshes (4%), and lakes and rivers (3%).
The month of September is characterized by gradually falling daily high temperatures, with daily highs ranging from 91Â°F to 87Â°F over the course of the month, exceeding 92Â°F or dropping below 85Â°F only one day in ten.
Over the course of September, the length of the day is gradually decreasing. The shortest day of the month is September 30 with 11:55 hours of daylight; the longest day is September 1 with 12:39 hours of daylight.
The earliest sunrise is at 7:09am on September 1; the latest sunset is at 7:48pm on September 1; the latest sunrise is at 7:21am on September 30; the earliest sunset is at 7:16pm on September 30.
Daylight saving time is observed in 2013 but it neither starts nor ends in September, so the entire month is in daylight time.
The median cloud cover ranges from 13% (mostly clear) to 24% (mostly clear). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 11% from the start to the end of the month.
On September 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 84% of the time, and overcast or mostly cloudy 11% of the time.
On September 30, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 32% of the time, and clear or mostly clear 66% 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 thunderstorms and light rain.
Thunderstorms are the most severe precipitation observed during 77% of those days with precipitation. They are most likely around September 1, when it is observed during 23% of all days.
Light rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around September 30, when it is observed during 5% 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 59% (mildly humid) to 88% (very humid) over the course of a typical September, rarely dropping below 52% (mildly humid), or exceeding 92% (very humid).
The air is driest around September 30, at which time the relative humidity drops below 63% (mildly humid) three days out of four; it is most humid around September 1, rising above 86% (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 68Â°F (muggy) to 78Â°F (oppressive) and is rarely below 64Â°F (mildy humid) or above 80Â°F (very oppressive).
Over the course of September typical wind speeds vary from 2 mph to 18 mph (light air to fresh breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around September 30, at which time the average daily maximum wind speed is 18 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around September 1, at which time the average daily maximum wind speed is 15 mph (moderate breeze).