Forecast indicates rain and storms over the weekend.

This election weekend and on Monday (5), the weather will be unstable and rainy in much of Brazil, with a risk of storms in areas of all regions. The presence of a low pressure area between northern Argentina, Paraguay and southern Bolivia, a trough over southern Brazil and, subsequently, the formation of an extratropical cyclone off the coast of Rio Grande do Sul, favor the maintenance of instabilities over much of the country.

On Saturday, rainfall is expected to be heavier in southeastern Minas Gerais and western Rio de Janeiro, where there is a red warning for high rainfall accumulations, and in northwestern, northern, and eastern São Paulo, the Triângulo Mineiro region, central and eastern Minas Gerais, and central and southern Espírito Santo, areas under an orange warning for high rainfall accumulations. There is also an orange warning for storms in Rio Grande do Sul, western Santa Catarina, and western Paraná.

On Sunday, the severity of the storms increases in Paraná, mainly in the western part of the state, where there is a red warning for extreme storm danger. The remaining areas of Paraná and southern Mato Grosso do Sul remain under an orange warning for storm danger, while other areas of the country, distributed across the five regions and including the Federal District, are under a yellow warning for potential storm danger.

On Monday, unstable weather patterns will persist, primarily affecting the South and parts of the Southeast and Midwest. The weather will become more stable only in areas of northern Brazil and in inland sectors of the Northeast. Temperatures will be mild in the South, parts of the Southeast, and the Federal District, while heat will prevail in other areas, with temperatures between 35°C and 39°C in the interior of the Northeast and the North.

Follow the forecast by region:

Northern Region

Saturday (3). In the west and south of the North region, rain with thunderstorms is expected in Amazonas. Isolated showers with thunderstorms are expected in central and southern Pará, southwestern Roraima, and Tocantins. Isolated showers are occurring in other areas of Roraima, Acre, Rondônia, and northeastern Pará. A yellow warning for potential storm danger is in effect for Amazonas, Rondônia, Tocantins, and southern and southwestern Pará. No rain is expected in northern Pará and Amapá. Minimum temperature of 22°C in Rio Branco (AC) and maximum of 36°C in Boa Vista (RR), Belém (PA), Manaus (AM), and Porto Velho (RO).

Sunday (4). Voters in the Northern region encountered unstable weather across much of the area. Showers with isolated thunderstorms occurred in central, western, and northwestern Amazonas and southwestern Tocantins. Cloudy skies with showers were expected in other areas of Amazonas, Acre, southwestern Roraima, northern and eastern Rondônia, and other parts of Tocantins. A yellow warning for potential storm danger was in effect for Tocantins, central and southern Pará, Rondônia, and central, southern, and southeastern Amazonas. There was also a possibility of isolated rain in northern and eastern Amapá and along the coastal strip of Pará. On the other hand, election Sunday would be sunny with few clouds in much of Roraima, northern and eastern Pará, southwestern Rondônia, and western and southern Amapá. Boa Vista (RR) will be the hottest capital in the region, with temperatures between 27°C and 37°C. In Porto Velho (RO), the minimum temperature will be 25 °C and the maximum 37 °C. In Rio Branco (AC), the temperature will vary between 23 °C and 33 °C.

Monday (5)The week begins with increased cloud cover and unstable weather across much of the northern region. Rain is accompanied by thunderstorms in Amazonas, northern and eastern Rondônia, southwestern Pará, central and western Roraima, and western Tocantins. No rain is expected only in central and western Acre. Isolated showers are expected in other areas. In Boa Vista (RR), the heat remains intense, with a minimum of 27°C and a maximum of 37°C. In Rio Branco (AC), the temperature will vary between 23°C and 34°C.

Northeast Region

Saturday (3). Unstable weather with rain in the interior of Northeast Brazil. Areas of instability forming in the interior of South America are affecting the western part of the Northeast region, with forecasts of showers and isolated thunderstorms in central and southern Maranhão, central, southern and western Piauí, and northwestern, western and southwestern Bahia. These areas are under a yellow warning for potential storm danger. Isolated showers are expected in other areas of Maranhão, northern Piauí, northwestern Ceará, and central and southern Bahia. Isolated showers are also expected during the evening along the eastern coast of the Northeast region, between Bahia, Sergipe, Alagoas, Pernambuco, Paraíba, and the eastern coast of Rio Grande do Norte. Slightly clearer weather with few clouds is expected in the interior of Alagoas, Pernambuco, and Paraíba. In other areas, cloudy skies are expected, but without rain. The minimum temperature among the capitals will be 22°C in Maceió (AL), and the maximum 39°C in Teresina (PI). In other capital cities, the maximum temperature ranges between 30°C and 32°C.

Sunday (4)Sunny weather across much of the Northeast region on election Sunday. Cloudiness in the west, south, and coastal areas of the region. Isolated showers in western Bahia, the western coast of Maranhão, and the coast of Bahia, Sergipe, Alagoas, Pernambuco, Paraíba, and the eastern coast of Rio Grande do Norte. The yellow warning for potential storm danger remains in effect for southwestern Maranhão and Piauí and western Bahia. Sunday will be sunny with few clouds in central Maranhão, much of Piauí and Ceará, western Rio Grande do Norte, central and western Paraíba and Pernambuco, western Alagoas and Sergipe, and northern Bahia. Minimum of 22°C in Maceió (AL) and maximum of 39°C in Teresina (PI). In other capitals, maximum temperatures will range between 30°C and 32°C.

Monday (5)The weather remains unchanged in the Northeast region. Along the coastal strip and in the west of the region, between western Maranhão and Bahia, the sky will be mostly cloudy with a possibility of isolated showers. In the interior of the region, between eastern Maranhão, central Piauí, southern and southwestern Ceará, western Paraíba and Pernambuco, and central and northern Bahia, sunny weather with few clouds is expected. Maceió (AL) and Recife (PE) will register the lowest temperatures among the capitals, at 22°C. The maximum temperature will be 38°C in Teresina (PI), 33°C in São Luís (MA), and 31°C in Fortaleza (CE), João Pessoa (PB), Recife (PE), Maceió (AL), Aracaju (SE), and Salvador (BA).

Central-West Region

Saturday (3). Cloudy skies with isolated showers across much of the Central-West region. In northeastern Mato Grosso and northern Goiás, rain is accompanied by isolated thunderstorms. There is a yellow warning for potential storm danger in northwestern, northern, central, southern, and eastern Mato Grosso, northern and eastern Mato Grosso do Sul, Goiás, and the Federal District. Rain is not expected only in the Dourados region (MS), where the sky will be mostly cloudy. Temperatures will drop significantly compared to what was observed during the week. In Brasília (DF), the minimum temperature will reach 18°C and the maximum should not exceed 25°C. In Goiânia (GO), temperatures will be mild, with a minimum of 21°C and a maximum of 26°C. In Campo Grande (MS), the maximum will be 30°C, and in Cuiabá (MT), the maximum will reach 32°C.

Sunday (4)Unstable and rainy weather is expected on election Sunday in the Central-West region. In northern Mato Grosso, Goiás, the Federal District, and much of Mato Grosso do Sul, there will be thunderstorms. More isolated showers are expected only in western and northwestern Mato Grosso do Sul and in southwestern and western Mato Grosso. For southern Mato Grosso do Sul, in the Amambai (MS), Iguatemi (MS), and Naviraí (MS) regions, there is an orange warning for dangerous storms. The remaining areas of the region are under a yellow warning for potentially dangerous storms. In Brasília (DF), unstable weather with rain and mild temperatures, between 19°C and 26°C. In other capitals, hot and humid weather is expected during the afternoon. Maximum temperatures of 31°C in Goiânia (GO), 33°C in Campo Grande (MS), and 34°C in Cuiabá (MT).

Monday (5)Areas of instability are intensifying, bringing rain and thunderstorms throughout the Central-West region. There is a yellow warning for potential storm danger in western, central, southern, and eastern Mato Grosso do Sul. In Brasília (DF), it will be another day with mild temperatures, with a minimum of 19 °C and a maximum of 26 °C. It will be hot in Campo Grande (MS), with a maximum of 35 °C, and in Cuiabá (MT), where the minimum will be 27 °C and the maximum 36 °C.

Southeast Region

Saturday (3). In the morning, the sky will be mostly clear along the southern coast of São Paulo and mostly cloudy in the west, central, and eastern parts of the state. This stable weather is not expected to last long. During the afternoon and evening, strong areas of instability will affect the region, causing rain across much of the Southeast. Rain and thunderstorms are forecast for central, southern, southeastern, and eastern Minas Gerais, Rio de Janeiro, northeastern and eastern São Paulo, and Espírito Santo.

Isolated showers are occurring in other areas. For southeastern Minas Gerais, in the Juiz de Fora region (MG), and for western and northwestern Rio de Janeiro, there is a red warning indicating a high risk of heavy rainfall. For the area between northwestern, northern, and eastern São Paulo, for the Triângulo Mineiro region, and for central and southern Espírito Santo, there is an orange warning indicating a high risk of heavy rainfall. Furthermore, for São Paulo, Rio de Janeiro, central and southern Espírito Santo, and for most of Minas Gerais, except for the northeastern part of the state, there is a yellow warning indicating a potential risk of thunderstorms.

Saturday will have mild temperatures across much of the region. In São Paulo (SP), it will be cold, with a low of 14°C and a high of 1°C. In Rio de Janeiro (RJ), the temperature will also be low, with a low of 19°C and a high of only 23°C. In Vitória (ES) and Belo Horizonte (MG), temperatures will be mild, with a high of 25°C in both capitals.

Sunday (4). Election day will be marked by unstable weather and rain across much of the Southeast region. Thunderstorms are expected in the Triângulo Mineiro, northwest Minas Gerais, northwest, west, central, and south of São Paulo. In other areas of the region, cloudy skies with showers are expected. A yellow warning for potential storms is in effect for the Triângulo Mineiro, northwest, west, central, south, and southeast of Minas Gerais, Rio de Janeiro, and São Paulo. Rain is not expected only in northern Minas Gerais. In São Paulo (SP), Brazil's largest electoral district, election Sunday will dawn at 15°C, but will warm up and become muggy with rain throughout the day. The maximum temperature will reach 27°C in the city of São Paulo. Rio de Janeiro (RJ) will register the highest temperature among the capitals, with a maximum of 30°C and muggy weather.

Monday (5)The week begins with instability over the west and south of the Southeast region. This will bring rain with thunderstorms to the Triângulo Mineiro, west, central, south and southeast of Minas Gerais, central, south and west of Rio de Janeiro, and throughout the state of São Paulo. For west, central and southeast São Paulo, there is a yellow warning for potential storm danger. Cloudy skies with isolated showers are expected in the Belo Horizonte (MG) region. Cloudy skies are expected in other areas with a possibility of isolated rain in Espírito Santo. Rain is not expected only in northeastern Minas Gerais. The weather will be muggy in the capital cities, with a minimum of 17°C in São Paulo (SP) and a maximum of 30°C in Vitória (ES) and Rio de Janeiro (RJ). In Belo Horizonte (MG), the temperature will be slightly milder, with a minimum of 18°C and a maximum of 26°C.

Region South

Saturday (3)The election weekend begins with sunny weather and few clouds across much of the Southern region. Cloud cover will increase by morning, and by afternoon, the sky will be mostly cloudy across the region, with isolated showers. In the evening, instability will intensify, and thunderstorms are possible from western and southwestern Paraná, central and western Santa Catarina, and throughout Rio Grande do Sul. These areas are under an orange warning for dangerous storms. Temperatures will be low in Curitiba (PR), with a minimum of 10°C and a maximum of 19°C. In Florianópolis (SC), temperatures will be mild, with a minimum of 14°C and a maximum of 21°C. In Porto Alegre (RS), the day will begin at 10°C, but the temperature will rise to 26°C before the rain.

Sunday (4). Risk of storms on election Sunday in southern Brazil. Rainy day with thunderstorms in Paraná, Santa Catarina, and northwestern and eastern Rio Grande do Sul. For western Paraná, in the regions of Cascavel (PR), Toledo (PR), Marechal Cândido Rondon (PR), Foz do Iguaçu (PR), and for the southwest of the state, in the regions of Francisco Beltrão (PR) and Pato Branco (PR), there is a red warning of high danger for storms. For the remaining areas of Paraná, except the coastal strip, and for western Santa Catarina, there is an orange warning of danger for storms. The occurrence of severe weather events cannot be ruled out. There is also a yellow warning of potential danger for storms in the remaining areas of Santa Catarina and in the northwest, north, and northeast of Rio Grande do Sul, including Porto Alegre (RS).

On the other hand, election Sunday will be sunny with many clouds, but without rain, in the west and southwest of Rio Grande do Sul, encompassing a large part of the Campanha Gaúcha region. The rains will keep temperatures low in the southern region. The minimum temperature will be 14 °C in Curitiba (PR), where the maximum should not exceed 19 °C. In Porto Alegre (RS), Sunday will have low temperatures, with a minimum of 15 °C and a maximum of 20 °C. In Florianópolis (SC), the temperature will be slightly milder, but should not exceed 22 °C.

Monday (5). The unstable weather continues in the Southern region. Rain with thunderstorms persists in Paraná, Santa Catarina, and the northwest, north, and northeast of Rio Grande do Sul. These areas remain under a yellow warning for potential storm danger. On the other hand, in the Campanha Gaúcha region, especially along the border with Uruguay, the week begins sunny, with few clouds. Temperatures remain low in the Southern region. The minimum temperature among the capitals will be 15°C in Porto Alegre (RS) and Curitiba (PR), but the maximum will not exceed 19°C in Curitiba (PR) and Florianópolis (SC) and 18°C in Porto Alegre (RS).