https://www.dailykos.com/stories/2023/11/17/2206375/-Heat-Index-in-Rio-de-Janeiro-hits-137-3-degrees-Fahrenheit?pm_campaign=front_page&pm_source=trending&pm_medium=web (this is during the 'spring' - our fall - and includes the heat index).

For their winter - on Aug 27, Rio witnessed its highest temperature of the winter, reaching 39.2°C

https://en.mercopress.com/2023/08/27/hot-weather-hits-rio-de-janeiro-this-winter

for winter, these temps are just bonkers.