Brazilian weather forecasters predict May 2026 will be hotter than normal with reduced overall rainfall across much of the country [1].
These shifting atmospheric patterns create significant regional volatility, threatening agricultural stability in dry zones while increasing flood risks in the south and northeast.
Dry and hot conditions are expected to dominate the North, Northeast, and Centro-Oeste regions [1]. In contrast, the South is experiencing higher precipitation levels, particularly in Paraná and Santa Catarina, driven by a weather trough [1, 4].
Atmospheric instability is also affecting other areas as a strong cold front moves into Bahia [2, 4]. This front is described as the strongest of the year so far [2].
While much of the nation remains dry, some cities have faced extreme isolated weather events. Fortaleza recently recorded 121 mm of rain on a single Sunday [3]. This event represents the third-largest rain event of 2026 for the city [3].
Forecasters said these contrasting patterns are the result of specific atmospheric drivers, including the aforementioned weather trough and the movement of cold fronts across the continent [2, 4].
“May 2026 will be hotter than normal with less rain across much of Brazil.”
The divergence between the arid interior and the saturated south highlights the increasing volatility of Brazil's seasonal weather. While the general trend for May 2026 is heat and drought, the occurrence of extreme rainfall events in cities like Fortaleza suggests that 'below normal' monthly averages can still mask dangerous, localized flooding.
