Rio de Janeiro recorded a scorching 44°C on Monday, October 17, marking the highest temperature measured by the city’s Alerta Rio system since 2014. The minimum temperature for the day was 21.6°C.
According to municipal meteorologists, a high-pressure system over the ocean is driving this extreme heat. Monday evening brought clear to partly cloudy skies with no rain expected, and winds remained weak to moderate.
The heatwave is set to persist through the week. On Tuesday, October 18, temperatures may again exceed 40°C under varied cloud cover, with no rainfall anticipated. Winds will strengthen slightly in the afternoon.
By Wednesday and Thursday, skies will remain mostly cloudy, and while temperatures may dip slightly, they will stay uncomfortably high without any rain relief. Friday promises clearer skies but continues the trend of elevated temperatures and dry conditions.
The city officially reached Heat Level 4—its second-most critical heat alert—at 12:35 p.m. on Monday. This level applies when temperatures range between 40°C and 44°C for at least three consecutive days or are forecasted to rise further.
Rio’s Response to Extreme Heat
Mayor Eduardo Paes and city officials had warned of this extreme heat during a press conference on Sunday, October 16. To mitigate the impact of the heatwave, Rio’s municipal government has activated 58 cooling centers across various neighborhoods.
These centers provide shaded areas, hydration points, and restrooms freely accessible to residents seeking relief from the oppressive conditions. Locations of these facilities can be found on the city’s Operations and Resilience Center (COR) app and website.
This prolonged heatwave highlights growing concerns about urban resilience amid rising global temperatures. With no immediate rain forecasted and temperatures remaining dangerously high, authorities continue urging residents to stay hydrated and avoid prolonged sun exposure during peak hours.
