Climate and monthly weather forecast
São Paulo, Brazil

Within São Paulo, Brazil, the prevailing climatic conditions align with the Cfa classification in Köppen's climate system, noted for the humid subtropical nature without a defined dry season. Geographically positioned between the tropics, the city experiences moderate temperatures, abundant rainfall, and ample sunshine throughout the year.

Looking at the monthly climatological parameters, it seems both temperature and humidity tend to remain relatively stable over the cycle of the year. The high temperatures average between 21.8°C (71.2°F) to 28°C (82.4°F), fluctuating moderately across the months, while the lows swing between 11.7°C (53.1°F) and 18.8°C (65.8°F). Despite occasional dips, the humidity retains a consistent average, ranging within 74% to 80%.

Rainfall in São Paulo, though present in all months to varying degrees, has an intriguing profile characterized by periods of increased and reduced precipitation. The highest volume of rainfall is recorded at 237mm (9.33") in month one, tapering towards the middle of the year to a low 40mm (1.57") in month eight, before climbing back towards the end of the year to 201mm (7.91"). The diurnal sunshine hours as well hover around a mean of 5.5 hours, with the sunlight duration spanning from 10.7 hours to 13.6 hours.

Days with rainfall too show a similar pattern, with peaks and troughs. Approximately 4 to 15 days of each month witness rains, highlighting the absence of a dry period. On the other hand, the UV index in São Paulo exhibits a clear trend - a descent from a high of 12 to a low of 5, before rising back to its peak, aligning with the varying angle of the sun across seasons.

Considering the entirety of weather elements, it becomes apparent that the period from month seven to month nine, typically in the southern hemisphere winter, can be deemed the best time to visit São Paulo. The city during this time experiences relatively cooler temperatures, with average high temperatures remaining between 21.8°C (71.2°F) to 23.9°C (75°F) and lows falling between 11.7°C (53.1°F) to 13.9°C (57°F). While the relative humidity hovers around 77%, the rainfall significantly subsides, averaging between 40mm (1.57") to 71mm (2.8"), reduced from the exceptionally high volumes recorded in the initial months.

Simultaneously, the average sunshine extends from 5.7 hours to 6 hours. Furthermore, the daily sunshine duration ranges from 10.8 hours to 12 hours, promising ample daylight for outdoor activities. Coupled with a moderate UV index, the period becomes particularly attractive for tourists favoring milder weather conditions and less rainfall.

In contrast, the first quarter of the year, typically summer to early autumn, may not be as conducive for travelers. The temperatures during this time tend to peak, with a high temperatures ranging from 27.2°C (81°F) to 28°C (82.4°F) and low temperatures ranging from 18.2°C (64.8°F) to 18.8°C (65.8°F). Coupled with high relative humidity of 80%, it can become uncomfortably warm.

Precipitation too is in abundance, with rainfall averaging between 161mm (6.34") to 237mm (9.33"), escalating to well above the yearly average. Moreover, while rainfall days range from 11 to 15 days per month, the UV index reaches its zenith at 12.

Spring in São Paulo is marked by a period of gradual increase in temperatures, with average highs ranging from 23.9°C (75°F) in the early spring to 27.2°C (81°F) in late spring, and lows climbing from 13.9°C (57°F) to 18.2°C (64.8°F). Humidity too sees a moderate spike to 80%.

Given its tropical geographical location, rains dominate the weather scenario even in spring, with rainfall ranging between 71mm (2.8") to 161mm (6.34"). The spring season witnesses rain on an average of 7 to 11 days per month, and UV index gradually builds up from 9 to 12.

A typical summer in São Paulo is characterized by high temperatures, peaking at 28°C (82.4°F), with lower limits not falling below 18.8°C (65.8°F). The relative humidity remains fairly stable, averaging around 80%.

Rainfall continues to dominate summers as well, with observed values stretching from 222mm (8.74") to 161mm (6.34"). The average rainfall days range from 11 to 14 days per month. Interestingly, the daylight hours and sunshine hours remain remarkably stable, with only slight fluctuations.

Autumn experiences a gradual decline in temperature, with the high temperature ranging from 25.1°C (77.2°F) in early autumn to a cool 21.8°C (71.2°F) in late autumn, and the low temperature also dipping from 16.3°C (61.3°F) to 11.7°C (53.1°F). Relative humidity drops to 79% to 77%.

Though rainfall still factored in during autumn, it significantly lessens, with averages dipping from 73mm (2.87") to 44mm (1.73"), lowering the average rainfall days observed. Concurrently, the UV Index descends from a high of 9 to a moderate range of 5.

The winter season in São Paulo regulates the high temperature within 21.8°C (71.2°F) to 23.3°C (73.9°F), whereas the low temperature swings between 11.7°C (53.1°F) and 12.8°C (55°F). Humidity is on a slight decline, averaging around 74 to 77%.

Winter season witnesses the city's driest months, making it an attractive period for visitors. Rainfall ranges between 40mm (1.57") to 71mm (2.8"), and the average rainfall days clock between four and seven days per month. In conjunction, São Paulo registers increasing sunshine hours, ascending UV index and ample daylight hours during this season.

January in São Paulo, Brazil ushers in the year with noticeable humidity. It is among the hotter months with temperatures peaking at 27.3°C (81.1°F), coupled with an extended daylight period of 13.4 hours. The city encounters an average of 15 days of rain, with precipitation reaching a significant average total of 237mm (9.33"). Weather in January »

February continues the trend established at the beginning of the year. This month experiences high humidity, extended daylight hours, and relatively high temperatures. São Paulo observes marginally lowered rainfall from January, averaging at 222mm (8.74") over 14 days. Weather in February »

March witnesses a distinct change in São Paulo's weather. Rainfall drops to an average of 161mm (6.34"), a significant decrease from the previous months, even as the temperature fluctuations moderate. Gradual cooling begins, with temperature highs dipping to 27.2°C (81°F). Weather in March »

April is typically a pleasant month in São Paulo, as the city enters its autumn season. While the decline in rainfall continues, decreasing to an average of 73mm (2.87") over seven days, temperature fluctuations become more noticeable. Weather in April »

São Paulo weather in May further signals the advancing autumn. It is relatively cooler and less humid than the previous months. Temperatures rarely rise above 23°C (73.4°F), with the rainfall continuing its downward trend to a moderate 71mm (2.8") total over six days. Weather in May »

The cool and dry June weather marks the onset of winter in São Paulo. A significant dip in temperatures with highs of 21.8°C (71.2°F), and low rainfall of 50mm (1.97") over four days characterizes the month. Despite the reduction in hours of daylight to 10.7, the city experiences brighter days with enhanced sunshine hours. Weather in June »

In July, São Paulo's weather remains dominated by cool temperatures and minimal precipitation. The month sees a further decline in rainfall, reaching its lowest point with a sparse average amount of 44mm (1.73") over four days only. Weather in July »

August sees São Paulo gradually begin to shake off its winter chill. Temperatures start to climb marginally with highs of 23.3°C (73.9°F), while rainfall experiences a slight decline, hitting rock bottom at 40mm (1.57") over four days. Weather in August »

September introduces São Paulo to the onset of Spring, with rising temperatures and increased precipitation. Rainfall increases substantially from August’s low, averaging 71mm (2.8") over seven days, signaling the gradual shift back towards wetter weather. Weather in September »

October brings with it a noticeable increase in temperature with highs reaching 24.8°C (76.6°F). A corresponding rise in rainfall to an average of 127mm (5") over ten days marks the return to more tropical weather patterns. It's an ideal time to experience São Paulo's botanical gardens and parks as they flourish under the increasing daylight hours. Weather in October »

November weather in São Paulo can be characterized by the increased humidity and escalating warm temperatures. The month witnesses elevated levels of precipitation, accumulating to an average of 146mm (5.75") over eleven days. Weather in November »

As the year concludes, December ushers in the peak of the Brazilian summer in São Paulo. The city experiences highs of 26.3°C (79.3°F) and an increase in daylight hours to 13.6, the longest throughout the year. Rainfall continues its upward trend, with the month recording an average total of 201mm (7.91") over 14 days, marking a return to early-year weather patterns. Weather in December »