This report describes the typical weather at the São Paulo-Guarulhos International Airport (São Paulo, Brazil) weather station over the course of an average July. It is based on the historical records from 1988 to 2012. Earlier records are either unavailable or unreliable.
São Paulo has a warm temperate climate with dry winters and hot summers. The area within 25 mi of this station is covered by grasslands (36%), croplands (24%), built-up areas (21%), forests (9%), and shrublands (9%).
The month of July is characterized by essentially constant daily high temperatures, with daily highs around 72°F throughout the month, exceeding 82°F or dropping below 60°F only one day in ten.
Over the course of July, the length of the day is essentially constant. The shortest day of the month is July 1 with 10:43 hours of daylight; the longest day is July 31 with 11:03 hours of daylight.
The earliest sunrise is at 6:41am on July 31; the latest sunset is at 5:44pm on July 31; the latest sunrise is at 6:49am on July 6; the earliest sunset is at 5:31pm on July 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in July, so the entire month is in standard time.
The median cloud cover is 85% (mostly 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 17% of the time, partly cloudy 9% of the time, and mostly cloudy or overcast 44% of the time.
The average probability that some form of precipitation will be observed in a given day is 31%, with little variation over the course of the month.
Throughout July, the most common forms of precipitation are drizzle, light rain, moderate rain, and thunderstorms.
Drizzle is the most severe precipitation observed during 36% of those days with precipitation. It is most likely around July 31, when it is observed during 12% of all days.
Light rain is the most severe precipitation observed during 35% of those days with precipitation. It is most likely around July 17, when it is observed during 11% of all days.
Moderate rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around July 1, when it is observed during 5% of all days.
Thunderstorms are the most severe precipitation observed during 14% of those days with precipitation. They are most likely around July 1, when it is observed during 5% 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 51% (mildly humid) to 99% (very humid) over the course of a typical July, rarely dropping below 31% (comfortable) and reaching as high as 100% (very humid).
The air is driest around July 28, at which time the relative humidity drops below 63% (mildly humid) three days out of four; it is most humid around July 2, rising above 100% (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 49°F (dry) to 59°F (comfortable) and is rarely below 42°F (dry) or above 63°F (mildy humid).
The time of the month between July 1 and July 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of July typical wind speeds vary from 1 mph to 12 mph (light air to gentle breeze), rarely exceeding 16 mph (moderate breeze).
The highest average wind speed of 6 mph (light breeze) occurs around July 26, at which time the average daily maximum wind speed is 12 mph (gentle breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around July 1, at which time the average daily maximum wind speed is 11 mph (gentle breeze).