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20181221-636809528681866787 ©MARCELO SAYAO/EFE/MAXPPP- Rio de Janeiro Brazil 20/12/2018 ; People relax along Ipanema beach at sunset in Rio de Janeiro, Brazil, 20 December 2018. With the start of summer scheduled for tomorrow night, 21 December 2018, forecasters predict that temperatures will remain elevated for at least another week in Rio de Janeiro and that it will be normal to see thermometers above 40 degrees Celsius.