In states like Rio Grande do Sul, Santa Catarina, and Paraná, the climate is milder, more akin to a North American summer. Temperatures are pleasant, averaging around 25°C to 30°C (77°F - 86°F), though heat waves can push them higher. This is also the wettest time of year for the South, keeping the vast pampas and vineyards lush and green.

New Year's Eve is a massive celebration, particularly on Copacabana Beach in Rio, where millions dress in white to watch fireworks.

It would be disingenuous to ignore the challenges of a Brazilian summer. The intensity of the heat is becoming more severe due to climate change. In recent years, Brazil has experienced historic heat waves where the thermal sensation (feels-like temperature) exceeded 60°C (140°F) in Rio de Janeiro.

While sunny, summer is also the rainy season. Afternoon downpours are common, especially in the Amazon and urban centers like São Paulo, providing brief cooling relief.