# Coastal swell and heavy sea warnings in Brazil

> Live situation record from CLSTR: https://clstr.news/situations/coastal-swell-and-heavy-sea-warnings-in-brazil
> Updated: 2026-08-24T19:52:41.000Z. Sources: 7. Developments: 2.

In early August, the passage of two extratropical cyclones in the South Atlantic and a strong polar air mass over Argentina triggered warnings for heavy seas and waves up to 3 meters along the Brazilian coast. These conditions primarily affected the South and Southeast regions, including Rio Grande do Sul, Santa Catarina, São Paulo, and Rio de Janeiro, with potential impacts later reaching the Northeast.

By late August, the Brazilian Navy issued a specific heavy swell alert for the coastlines between Ilhabela (SP) and Campos dos Goytacazes (RJ). During this period, waves were predicted to reach up to 3 meters, and authorities warned of potential flooding in the Baixada Santista region due to water levels in estuary channels rising approximately 40 centimeters above normal tide levels. Safety recommendations included suspending navigation for small and medium vessels and avoiding swimming or proximity to rocky cliffs.

## Timeline

### 2026-08-24: Brazilian Navy issues swell alert for São Paulo and Rio coasts

The Brazilian Navy has issued a swell alert for the São Paulo and Rio de Janeiro coasts through Thursday, with waves up to 3 meters expected and risks of coastal flooding.

7 sources. https://clstr.news/cluster/baixada-santista-on-alert-for-flooding-and-marine-animal-deaths

### 2026-08-09: Brazil coast faces heavy swells and 3-meter waves

Extratropical cyclones are causing heavy seas and waves up to 3 meters along Brazil's coast, with specific swell warnings issued for the South, Southeast, and oceanic beaches in Niterói.

6 sources. https://clstr.news/cluster/brazil-coast-faces-heavy-swells-and-3-meter-waves

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Cite as: Coastal swell and heavy sea warnings in Brazil. CLSTR, https://clstr.news/situations/coastal-swell-and-heavy-sea-warnings-in-brazil