Rio Grande do Sul faces a series of severe storms, heavy rain, and hail beginning Thursday, June 16, 2026 [1].

These weather patterns pose significant risks to infrastructure and public safety in southern Brazil. The combination of cold fronts and low-pressure areas is creating atmospheric instability that triggers violent weather events during an atypical period for such intensity.

According to the meteorology team at G1, wind speeds could reach up to 100 km/h [2]. These winds are expected to bring unseasonable rains to various regions, including the state of Rio Grande do Sul [2]. Some areas may experience precipitation volumes of up to 100 mm [2].

Climatempo said that the instability may extend throughout the following week. The forecast includes intense rainfall, strong winds, hail, and a high frequency of lightning strikes [3]. This extended period of volatility follows a trend of strengthening cold fronts that have impacted several regions of Brazil since May [4].

Local authorities and residents are monitoring the situation as the system moves through the region. While some reports suggest rain may lose strength gradually over the week, other meteorological data indicates that the potential for heavy precipitation remains high [2].

"Ventania de até 100 km/h pode atingir várias regiões, inclusive o Rio Grande do Sul, trazendo chuvas fora de época," the G1 meteorology team said [2].

Climatempo said that the forecast suggests "instabilidade pode se estender ao longo da próxima semana, com temporais, chuvas intensas, ventos fortes, granizo e grande quantidade de raios" [3].

“Wind speeds could reach up to 100 km/h”

The convergence of high-velocity winds and significant rainfall in June suggests a disruption of typical seasonal patterns in southern Brazil. When wind speeds reach 100 km/h alongside 100 mm of rain, the risk of flash flooding and structural damage increases, requiring heightened vigilance from civil defense authorities to prevent casualties and economic loss in the agricultural sector.