This report describes the typical weather at the Scholes International Airport at Galveston (Galveston, Texas, United States) weather station over the course of an average August. It is based on the historical records from 1992 to 2012. Earlier records are either unavailable or unreliable.
Galveston, 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 (76%) and croplands (21%).
The month of August is characterized by essentially constant daily high temperatures, with daily highs around 90°F throughout the month, exceeding 93°F or dropping below 85°F only one day in ten.
Over the course of August, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 46 minutes, implying an average day-over-day decrease of 1.5 minutes.
The shortest day of the month is August 31 with 12:45 hours of daylight; the longest day is August 1 with 13:31 hours of daylight.
The earliest sunrise is at 6:40am on August 1; the latest sunset is at 8:11pm on August 1; the latest sunrise is at 6:57am on August 31; the earliest sunset is at 7:42pm on August 31.
Daylight saving time is observed in 2012 but it neither starts nor ends in August, so the entire month is in daylight time.
The median cloud cover is 11% (mostly clear) and does not vary substantially over the course of the month.
On August 16, a representative day, the sky is clear or mostly clear 68% of the time, partly cloudy 7% of the time, and mostly cloudy or overcast 16% of the time.
The average probability that some form of precipitation will be observed in a given day is 40%, with little variation over the course of the month.
Throughout August, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 62% of those days with precipitation. They are most likely around August 15, when it is observed during 26% of all days.
Light rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around August 25, when it is observed during 9% of all days.
Moderate rain is the most severe precipitation observed during 10% of those days with precipitation. It is most likely around August 7, when it is observed during 4% of all days.
Either snow is exceptionally unlikely to fall at this location in August or this station does not reliably report precipitation types.
The relative humidity typically ranges from 59% (mildly humid) to 86% (very humid) over the course of a typical August, rarely dropping below 47% (comfortable), or exceeding 95% (very humid).
The air is driest around August 30, at which time the relative humidity drops below 65% (mildly humid) three days out of four; it is most humid around August 31, rising above 81% (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 August, the dew point typically varies from 71°F (muggy) to 77°F (oppressive) and is rarely below 66°F (muggy) or above 79°F (oppressive).
Over the course of August typical wind speeds vary from 2 mph to 15 mph (light air to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around August 5, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around August 25, at which time the average daily maximum wind speed is 14 mph (moderate breeze).