Latest forecast guidance from multiple models points to a cool, overcast Monday in Buenos Aires with easterly to southeasterly winds and periods of light rain or drizzle, which are expected to limit daytime heating and keep the maximum temperature near 18–19 °C. Persistent low-level cloud cover and higher humidity will reduce solar insolation, while the marine influence from the Río de la Plata further moderates afternoon peaks relative to typical late-September climatology. Trader consensus favoring 20–21 °C likely reflects uncertainty in exact timing of any clearing or model spread on boundary-layer mixing, with resolution hinging on official Servicio Meteorológico Nacional observations for the calendar day. Updated model runs and surface analyses tonight will clarify whether stronger mixing can push readings marginally higher.