Winter in Brazil usually runs June to September.
3 Nov 2016 – Headline a newspaper in Porto Alegre, capital of the State of Rio Grande do Sul, Brazil:
‘Rio Grande do Sul hit by frost and typical winter temperatures. Local minimum was recorded in Soledade at 1,7ºC.’
Some communities reported frost.
The recent situation of consecutive cyclones, cold temperatures, etc. has demanded an analysis by meteorologists at an Uruguayan TV channel.
The following animation shows what happened in the most recent episode of cyclone ocurrence. Strong winds hit this region whenever there is a shock of hot, wet air with cold, polar dry air. Normally the hot air comes from the tropical region of South America but in this case it has come from the Pacific coast as you can see.
Thanks to Gabriel for this link