I'm located near Buenos Aires. There was a similar hot spell several weeks ago, mid-July. Record high in July is (according to Wikipedia) 30.2C, and I don't have the data but this record could have been very well exceeded during those extremely warm days.
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It looks like 23 July, one day. It got up to about 28 degrees. Between 10-20 July I see nothing hotter than 20 degrees. This is US GFS data. Maybe I'm wrong. Also looking only at BA, it was hotter to the north west
There's high altitude winds from too warm pacific tropic oceans to south america, that is probably involved in the process I think