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INMET forecasts rains above 60 mm in the North and parts of the Northeast between May 20 and 27. South will have storms with lightning and wind. See your region.
The National Institute of Meteorology (INMET) has released, through Meteorological Bulletin No. 18/2025, the weather forecast for the period of May 20 to 27. The scenario is uneven across regions: while the north of the country and parts of the northeastern coast are expected to record rainfall volumes exceeding 60 mm, much of the Midwest and the interior of the Southeast will have a dry and stable week. Meanwhile, the South is preparing to face two episodes of storms with lightning and wind gusts.
Northern Region: Roraima, Amazonas, and Amapá with higher risk of heavy rain
The states of Roraima, Amazonas, Amapá, and areas of Pará concentrate the highest precipitation expectations of the week, with accumulations that can exceed 60 mm. On the other hand, the southern portion of the Amazon is expected to have less intense rains, and localities in the southeast of Pará and Rondônia may experience a week of stable weather.
Northeast: rainy coast and dry in the western interior
In the Northeast, the distribution of rainfall also varies greatly depending on the location. According to INMET, volumes above 50 mm are forecasted for the northwest of Maranhão, the interior of Ceará, and the entire coastal strip from Rio Grande do Norte to Bahia.
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For the other areas of the region, the expectation is for light precipitation, below 20 mm. In some municipalities — especially in the west of Bahia and the south of Maranhão and Piauí — it may not rain at all, with a further reduction in relative humidity over the days.
South of the country on alert: two cold front systems in the same week
The Southern Region is the one that requires the most attention this week. INMET forecasts the passage of two cold fronts — the first between May 19 and 20, and the second starting on the 25th. Each of them may bring isolated storms, with rain accompanied by lightning and wind gusts, and accumulations ranging between 20 mm and 50 mm.
Check the summary by region
- North: rain above 60 mm in Roraima, Amazonas, Amapá, and parts of Pará; stable weather in the southeast of Pará and in Rondônia
- Northeast: above 50 mm in the northwest of Maranhão, interior of Ceará, and coast from RN to Bahia; below 20 mm in the rest; dry in the west of Bahia and south of Maranhão and Piauí
- Central-West and interior of the Southeast: predominance of stable weather; occasional rain below 10 mm in the northwest of Mato Grosso and south of Mato Grosso do Sul
- East of the Southeast: rain above 50 mm due to moisture transport from the ocean
- South: isolated storms with lightning and wind; volumes between 20 mm and 50 mm; two cold fronts on the 19th–20th and starting on the 25th
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