Current short-range model consensus from sources like the GFS and ECMWF points to a mild early-spring day in Buenos Aires on September 1, with a forecast maximum near 18°C under mostly sunny skies and light southeasterly flow. This aligns closely with the long-term September average high of roughly 19–20°C, shaped by the seasonal transition from winter anticyclones and the moderating influence of the Río de la Plata. Trader sentiment clusters tightly around 19–21°C because small differences in insolation from variable cloud cover, weak frontal advection, or urban heat-island effects at the official observing site can shift the daily peak by 1–2°C. Ensemble spreads remain modest this close to the event, limiting support for outcomes below 18°C or above 22°C absent an unexpected warm-air surge from the north. Updated model runs through the next 48 hours will be the key catalyst for any further adjustment in implied probabilities.