EN 
PT_BR 
Traditionally, January is a very rainy and very hot month in Paraná. According to the Paraná Environmental Technology and Monitoring System (Simepar), in 2026 the first month will have rainfall and temperatures within the historical average, with the classic summer storms during the warmest periods.
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In January, intense masses of hot and humid air predominate. Because the atmosphere retains a large amount of moisture, storms form frequently. "More significant, heavier rainfall occurs between the afternoon and evening. Summer storms don't last very long, but because they have a great capacity to generate rain, they often lead to flooding, inundations, and sometimes even flash floods," explains Reinaldo Kneib, meteorologist at Simepar.
In mountainous regions, this process is intensified. For this reason, it is common on the coast to experience quick rain showers with volumes of up to 50 mm, which already occurred in December 2025 and are expected to occur again in January 2026. “In the interior of the state, we also have this condition when it gets very hot. The atmosphere transforms this energy into storm clouds, cumulonimbus clouds, which lead to these more severe events. And in addition to rain, there is always the possibility of hail, stronger wind gusts, and lightning strikes,” Reinaldo points out.
According to the meteorologist, no drought period is expected in January 2026. Temperatures will remain high on average, and due to high humidity, the perceived temperature will frequently be higher than what is recorded on thermometers, causing the discomfort of mugginess.
Averages
In January, the days dawn warmer, with temperatures above 20°C, throughout the western, northwestern, and coastal regions, as well as in the cities.
Photo: José Fernando Ogura/AEN
Closer to the border area with São Paulo. Minimum temperatures are lower in the Campos Gerais and southern parts of the state, averaging between 16°C and 18°C. In the rest of the state, minimum temperatures are between 18°C and 20°C.
Historically, the average temperature in January is above 26°C in Foz do Iguaçu and surrounding cities. In cities near Cascavel and Toledo, Maringá, Londrina, Telêmaco Borba, and Francisco Beltrão, the average January temperature historically ranges between 22°C and 24°C.
It is warmer in other cities in the western, northern, and northwestern regions, with temperatures between 24°C and 26°C. In the Apucarana, Campos Gerais, and Curitiba Metropolitan Region (except for the capital), the average January temperature historically ranges between 20°C and 22°C. Historically, average January temperatures are lower in Curitiba, General Carneiro, and Palmas: between 18°C and 20°C.
Historically, maximum temperatures in January exceed 30°C in the West, Southwest, Northwest, northern part of the coast, and in cities bordering the state of São Paulo. The exception is Cascavel, which, along with the cities around Pato Branco, Telêmaco Borba, the eastern part of the Curitiba Metropolitan Region, and the southern part of the Paraná coast, historically registers maximum temperatures between 28°C and 30°C in January. Historically, maximum temperatures in January are lower only in the Campos Gerais and South regions: between 26°C and 28°C.
Photo: Disclosure
Rainfall in January is historically very high. The regions with the least rainfall are around Jaguariaíva and Foz do Iguaçu, with average accumulated rainfall between 100 mm and 125 mm. In the capital, in the far west, and cities around São Mateus do Sul, Pato Branco, and Terra Rica, rainfall in January historically ranges between 125 and 150 mm.
Historically, rainfall in January is highest along the coast, exceeding 300 mm. It also ranges between 225 and 300 mm in the region around Cândido de Abreu. In the region around Maringá and Londrina, and in cities near General Carneiro, Cascavel, and Rio Negro, the accumulated rainfall in January historically ranges between 200 mm and 225 mm. In the rest of the state, the average accumulated rainfall historically ranges between 175 mm and 200 mm.
