In states like Paraná, Santa Catarina, and Rio Grande do Sul, the climate is subtropical (Cfa/Cfb). Unlike the north, there is no true "dry season" here. It rains consistently throughout the year, but the nature of the rain changes.
This is the quintessential Brazilian tropical summer. The rains do not arrive as a persistent drizzle but as violent, predictable afternoon thunderstorms. The heat builds throughout the morning, culminating in a crashing release of energy in the late afternoon. when is rainy season in brazil