Trader consensus has locked in 19°C as the highest temperature recorded in Buenos Aires on September 15, reflecting official meteorological observations from the Servicio Meteorológico Nacional confirming that daily maximum under clear, stable high-pressure conditions. Mid-September climatology for the city typically features highs of 17–21°C, with light southerly flow limiting warm advection from the north and minimal urban heat island enhancement at the primary measurement site. Model guidance and surface analyses showed no anomalous warming events that day. While final quality-controlled data releases could theoretically prompt minor revisions, historical precedent indicates such adjustments rarely exceed 0.5°C once preliminary readings are issued.