Winter has arrived, and it is announcing itself with force.
A quarta frente fria do ano de 2025 desceu sobre o centro-sul do Brasil no início desta semana, carregando consigo uma massa de ar polar que registrou as temperaturas mais baixas do ano em São Paulo, Rio de Janeiro e Curitiba. Na região Sul, a neve cobriu cidades serranas de Santa Catarina e o frio negativo se instalou em áreas elevadas, enquanto o Nordeste permaneceu alheio ao fenômeno, quente e seco. O inverno, como sempre, não pede licença — ele simplesmente chega, e desta vez chegou com força. A previsão é de alívio gradual a partir de segunda-feira, 7 de julho, mas a estação ainda reserva novas ondas para as próximas semanas.
- As temperaturas mais baixas do ano foram registradas em 2 de julho em grandes cidades do centro-sul, com o frio polar surpreendendo até quem já esperava pelo inverno.
- O Sul do país enfrenta o peso maior da onda: geadas, temperaturas negativas e neve nas serras catarinenses de São Joaquim, Urubici e Urupema na virada de junho para julho.
- Até regiões incomuns, como o sul de Rondônia, o leste do Acre e o extremo sul do Amazonas, sentem a friagem — aquela queda brusca de temperatura que desafia a lógica tropical.
- O Nordeste permanece em outro mundo climático: interior seco e quente, entre 25 e 28 graus, enquanto o sul do país treme sob cobertores.
- A previsão aponta alívio a partir de 7 de julho, mas o calendário do inverno avisa: outras frentes frias estão a caminho antes que a estação termine.
A quinta-feira amanheceu com frio cortante no centro-sul do Brasil. Uma massa de ar polar se instalou na região no início da semana, trazendo a quarta frente fria do ano e as temperaturas mais baixas de 2025 até agora. Segundo a Climatempo, o alívio está previsto para a segunda-feira, 7 de julho, quando os termômetros devem começar a subir gradualmente.
A quarta-feira, 2 de julho, foi o dia mais frio do ano em São Paulo, Rio de Janeiro e Curitiba. Em Rio Branco, capital do Acre, a madrugada registrou a aurora mais gelada de 2025. O inverno não apenas chegou — ele se impôs.
O Sul carrega o peso maior. Temperaturas negativas e geadas dominam as áreas elevadas, e neve caiu nas serras catarinenses de São Joaquim, Urubici e Urupema na noite de 30 de junho. O Sudeste sente o frio com mais intensidade no Vale do Ribeira, em Presidente Prudente e na capital paulista. No Centro-Oeste, Mato Grosso do Sul e partes do Mato Grosso registram mínimas entre cinco e dez graus. Até o Norte não escapou: o fenômeno conhecido como friagem atingiu o sul de Rondônia, o leste do Acre e o extremo sul do Amazonas.
O Nordeste, por sua vez, vive outro clima. O interior permanece seco e quente, com máximas entre 25 e 28 graus, enquanto o litoral enfrenta apenas chuvas esparsas — um contraste gritante com o sul em polvorosa.
O frio deve persistir pelo fim de semana, cedendo espaço a partir de segunda-feira. Mas o inverno ainda tem muito a dizer: novas frentes frias devem retornar antes que a estação chegue ao fim.
Thursday morning arrived with a bite. If you woke up feeling the chill, you were almost certainly somewhere in Brazil's center-south region, where a polar air mass had settled in at the start of the week, bringing with it the season's second cold front and the fourth to sweep across the country since January began. The good news, according to forecasters at Climatempo, is that the deep freeze has an expiration date: Monday, July 7th, when temperatures should begin their gradual climb back toward normal.
But the cold this week has already left its mark. Wednesday afternoon, July 2nd, delivered the year's coldest temperatures yet to São Paulo, Rio de Janeiro, and Curitiba. In Rio Branco, the capital of Acre state, that same morning brought the coldest dawn recorded so far in 2025. The pattern is unmistakable: winter has arrived, and it is announcing itself with force.
The affected zone stretches across much of the southern and central portions of the country, though not uniformly. In the lightest-touched areas—shown in pale blue on meteorological maps—temperatures are running three to five degrees Celsius below their seasonal average, cold enough to notice but not quite cold enough to earn the formal designation of a cold wave. The real intensity concentrates elsewhere.
The South bears the brunt. Every state in the region is gripped by intense cold, with negative temperatures settling into elevated areas and frost spreading across the landscape. In the mountain towns of Santa Catarina—São Joaquim, Urubici, Urupema—snow fell on the night of June 30th. The Southeast feels the wave's impact most sharply in its southern reaches: the Vale do Ribeira, Presidente Prudente, and São Paulo city itself experience the deepest cold, though much of the broader region holds closer to seasonal norms, with merely cool nights and mornings. Mato Grosso do Sul and portions of Mato Grosso in the Center-West region are seeing sharp temperature drops, with overnight lows between five and ten degrees Celsius. Even parts of the North—southern Rondônia, eastern Acre, the extreme south of Amazonas—are experiencing what locals call friagem, a phenomenon of temperatures plummeting well below average.
The Northeast, by contrast, sits outside the cold system entirely. Its interior remains dry and warm, with daytime highs between 25 and 28 degrees Celsius, while the coast faces only scattered rain. It is a stark contrast to the shivering south.
The duration is finite but not immediate. The cold should hold through the weekend and into early next week, loosening its grip as Monday approaches. Yet this is winter now, and the calendar guarantees nothing. Additional cold fronts will almost certainly return before the season ends. For now, the thermometers will rise. But the pattern is set.
Notable Quotes
Temperatures should begin their gradual climb back toward normal starting Monday, July 7th— Climatempo weather service
The Hearth Conversation Another angle on the story
Why does a fourth cold front in a single year feel significant? Isn't that normal for winter?
It's the compression that matters. Four in seven months is aggressive. Usually you'd see them more spread out. It signals the polar air is being pushed north more frequently than typical—which can mean a harder winter overall.
The snow in Santa Catarina—is that unusual for early July?
Not impossible, but it's notable enough that they're reporting it. Those towns sit high enough that snow is possible any winter month, but you don't see it announced unless it's worth mentioning. It marks how far south the cold actually reached.
Why does the Northeast escape this entirely?
Geography and air currents. The polar mass moves north from the south, but it loses energy as it travels. By the time it would reach the Northeast, it's dissipated. The Northeast's latitude and the way the jet stream moves that week just don't align to bring the cold there.
If temperatures rise Monday, does that mean the cold is over?
For this particular system, yes. But winter is just starting. This is the pattern now—cold fronts will keep arriving. You get a few warm days, then another one comes through. It's not a permanent thaw; it's a rhythm.
What does friagem mean exactly?
It's a regional term in the North for when temperatures drop sharply below what's normal for that area. It's not necessarily freezing, but it's shocking to the local climate and to people's bodies. In Acre or Rondônia, a sudden drop to five or ten degrees feels extreme because they're used to much warmer air.