# Brazil cold front spreads heavy rain and wind alerts

> Live situation record from CLSTR: https://clstr.news/situations/brazil-cold-snap-in-southern-states
> Updated: 2026-08-04T08:22:00.000Z. Sources: 24. Developments: 3.

The cold front that first produced a freeze in Paraná has spread across Brazil’s southern states, extending the chill to Rio Grande do Sul, Santa Catarina, São Paulo and Mato Grosso do Sul. Forecasts warn of a rapid temperature drop to around 5 °C in parts of Rio Grande do Sul and Santa Catarina, with frost alerts for those states plus Paraná and Mato Grosso do Sul. Strong wind gusts of up to 100 km/h are expected in Rio Grande do Sul, Santa Catarina and Paraná, accompanied by rain, hail and thunderstorms. Inland, a dry air mass will keep relative humidity at 12‑20 % across the Central‑West and parts of the Southeast, while daytime highs may reach 37 °C in Goiás and the Triângulo Mineiro, raising fire‑risk concerns for the Goiânia metropolitan area and degrading air quality. An “Arco de Tempestades” line will bring intense thunderstorms and winds up to 50 km/h to Mato Grosso, Rondônia, Acre and Amazonas, and saturated soils in Rio Grande do Sul increase flooding, landslide and fallen‑tree risks. New forecasts show the front reaching Brazil’s northeast coast from southern Bahia to Rio Grande do Norte, with the heaviest rain expected in Alagoas, Pernambuco and Paraíba. Urban‑flooding warnings have been issued for Recife and João Pessoa, and isolated landslides are possible on city slopes. Wind gusts exceeding 100 km/h are also forecast for Minas Gerais, Rio de Janeiro and Goiás, prompting alerts for tree falls and power outages. The system is expected to intensify from 4 to 7 August, with the most severe winds projected for Friday night across the Serra Gaúcha and the highlands of Santa Catarina. The latest outlook adds rain totals of up to 100 mm in the southern states and highlights a heightened flood risk along the Uruguay River basin.

## Claims

- A cold front is moving into southern Brazil, bringing wind gusts up to 100 km/h in Rio Grande do Sul, Santa Catarina and Paraná. (corroborated by 2 sources)
- Temperatures are forecast to drop to around 5 °C in parts of Rio Grande do Sul and Santa Catarina, with frost possible in those states and in Paraná, São Paulo and Mato Grosso do Sul. (corroborated by 2 sources)
- Central‑West and Southeast Brazil will experience dry air with relative humidity between 12 % and 20 % and daytime highs up to 37 °C. (corroborated by 2 sources)
- In São Paulo, the maximum temperature is expected to fall from about 30 °C to about 21 °C in one day. (single source)
- Dry conditions increase fire risk and degrade air quality in the Goiânia metropolitan area. (single source)
- An “Arco de Tempestades” will affect Mato Grosso, Rondônia, Acre and Amazonas, bringing intense thunderstorms and winds up to 50 km/h. (single source)
- Saturated soils in Rio Grande do Sul increase the risk of flooding, landslides and fallen trees. (single source)

## Timeline

### 2026-08-04: Brazil's South and Northeast face severe cold front, heavy rain alerts

A cold front sweeps Brazil, bringing heavy rain, hail, and wind gusts over 100 km/h, prompting Inmet and Cemaden alerts for floods and landslides in the South and along the Northeast coast.

12 sources. https://clstr.news/cluster/cold-front-brings-heavy-rain-and-galeforce-winds-to-brazils-northeast-and-centersouth

### 2026-07-30: Brazil's southern cold front brings strong winds, rain and frost

A cold front hits southern Brazil with winds up to 100 km/h, rain, hail and frost, while dry air brings heat and fire risk elsewhere; a storm arc affects the North‑West.

14 sources. https://clstr.news/cluster/brazil-braces-for-polar-air-mass-bringing-cold-snap-to-five-states

### 2026-07-04: Paraná sees freezing temperatures as cold front sweeps state

Paraná experienced a cold snap with frost and temperatures down to –3 °C on July 24, while earlier forecasts warned of max 18 °C in Marechal Cândido Rondon and widespread sub‑zero lows.

3 sources. https://clstr.news/cluster/paran-sees-freezing-temperatures-as-cold-front-sweeps-state

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Cite as: Brazil cold front spreads heavy rain and wind alerts. CLSTR, https://clstr.news/situations/brazil-cold-snap-in-southern-states