Current forecast models from sources including the National Weather Service equivalents and European ensembles project a daytime maximum near 19°C in Buenos Aires on September 15, driven by moderate westerly to southwesterly flow under high pressure and limited cloud cover through midday. Afternoon temperatures will hinge on the timing of a strengthening southeasterly breeze and increasing low-level moisture, which could cap the peak by 1–2°C or allow brief warming to 20°C if insolation persists longer. These near-term variables explain the tight market clustering around 19–20°C, as small shifts in boundary-layer mixing or frontal timing can alter the daily high by the resolution threshold. Updated model runs overnight and early-morning observations will provide the clearest signal ahead of the market close.