Tatiana Cesso
Rio de Janeiro recorded its hottest day of the winter season on Wednesday, September 11. According to the Sistema Alerta Rio, the city’s meteorological agency, temperatures soared to 104.7°F (40.4°C) at 2:40 p.m. in Irajá, a northern district. The previous record for the winter was set on August 23, 2024, at the Guaratiba weather station in the western part of the city, where temperatures reached 102.0°F (38.9°C).
In addition to the high temperatures, the city has declared a state of emergency due to critically low relative humidity levels. According to the World Health Organization (WHO), relative humidity dropped below 12%. Alerta Rio reported that humidity fell to 11.8% at 2:50 p.m. in Irajá.
From Thursday, September 12, to Friday, September 13, stable weather conditions will persist due to a high-pressure system. The sky will be mostly clear to partly cloudy with no rain forecasted. Winds will vary from light to moderate, with stronger gusts expected in the morning. Relative humidity may range between 21% and 30% in the afternoon.
On Saturday, September 14, late in the day, moist oceanic winds will begin to influence the city’s weather. Expect varied cloudiness from the evening, with no rain anticipated. Temperatures will remain high, and winds will be moderate. Afternoon humidity will range from 21% to 30%.
A change in weather is expected on Sunday, September 15, as a cold front approaches from the ocean. This will bring increased cloud cover and a chance of light, isolated rain showers by late afternoon. Winds will be moderate to strong, and temperatures will begin to decline.
Source: Agência Brasil
