Forecast consensus for Buenos Aires on September 28 centers on a 19–21°C daily maximum, driven by persistent easterly flow advecting cooler maritime air from the South Atlantic and extensive cloud cover that limits solar insolation. Multiple models show mostly cloudy to overcast conditions with light showers possible, suppressing peak heating relative to clearer spring days. This setup keeps temperatures near or slightly above seasonal normals for late September, with the exact high hinging on the timing and extent of any afternoon clearing or embedded instability. Trader positioning around 20–21°C reflects the narrow uncertainty band in current guidance, while lower or higher outcomes would require unexpected shifts in wind direction or reduced cloud cover.