This report describes the typical weather at the São Paulo-Guarulhos International Airport (São Paulo, Brazil) weather station over the course of an average year. 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%).
Over the course of a year, the temperature typically varies from 52°F to 83°F and is rarely below 46°F or above 90°F.
The warm season lasts from November 29 to March 24 with an average daily high temperature above 81°F. The hottest day of the year is February 27, with an average high of 83°F and low of 66°F.
The cold season lasts from May 13 to August 8 with an average daily high temperature below 73°F. The coldest day of the year is July 19, with an average low of 52°F and high of 71°F.
The length of the day varies significantly over the course of the year. The shortest day is June 20 with 10:41 hours of daylight; the longest day is December 21 with 13:36 hours of daylight.
The earliest sunrise is at 5:28am on October 20 and the latest sunset is at 7:58pm on January 13. The latest sunrise is at 6:59am on February 25 and the earliest sunset is at 5:27pm on June 5.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on October 21 and ending in the fall on February 25.
The median cloud cover is 87% (mostly cloudy) and does not vary substantially over the course of the year.
On May 22, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 30% of the time, and overcast or mostly cloudy 45% of the time.
On October 3, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 72% of the time, and clear or mostly clear 11% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around January 19, occurring in 73% of days. Precipitation is least likely around June 24, occurring in 30% of days.
Over the entire year, the most common forms of precipitation are thunderstorms, light rain, drizzle, and moderate rain.
Thunderstorms are the most severe precipitation observed during 44% of those days with precipitation. They are most likely around February 2, when it is observed during 47% of all days.
Light rain is the most severe precipitation observed during 29% of those days with precipitation. It is most likely around October 15, when it is observed during 19% of all days.
Drizzle is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around August 31, when it is observed during 12% of all days.
Moderate rain is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around January 4, when it is observed during 10% of all days.
During the warm season, which lasts from November 29 to March 24, there is a 68% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (60% of days with precipitation have at worst thunderstorms), light rain (22%), moderate rain (12%), and drizzle (5%).
During the cold season, which lasts from May 13 to August 8, there is a 31% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (37% of days with precipitation have at worst light rain), drizzle (29%), thunderstorms (17%), and moderate rain (15%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 45% (comfortable) to 99% (very humid) over the course of the year, rarely dropping below 24% (dry) and reaching as high as 100% (very humid).
The air is driest around August 23, at which time the relative humidity drops below 58% (mildly humid) three days out of four; it is most humid around April 14, exceeding 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 year, the dew point typically varies from 49°F (dry) to 71°F (muggy) and is rarely below 42°F (dry) or above 75°F (very muggy).
The time of the year between April 25 and November 1 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 1 mph to 13 mph (calm to moderate breeze), rarely exceeding 18 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around September 28, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around April 30, at which time the average daily maximum wind speed is 11 mph (gentle breeze).