**Forecast models and official guidance from Argentina’s Servicio Meteorológico Nacional (SMN) and international sources point to a highest temperature of 17–18 °C on 27 August 2026 in Buenos Aires, with the market’s tight clustering around 18 °C (32.5 %) and 19 °C (35 %) reflecting that narrow range.** A southerly wind shift behind a weak frontal boundary is expected to limit afternoon warming while increasing cloud cover and scattered showers or thunderstorms, especially during the morning and midday hours. This setup caps the daily maximum near or slightly above the seasonal average high of roughly 16 °C. Recent model runs show afternoon readings stabilizing at 17–18 °C under mostly cloudy skies, with dew points in the 11–13 °C range and moderate southeast winds near 15–20 km/h further suppressing temperature rise. Slight upward revisions to 19–20 °C remain possible if breaks in cloud cover allow more insolation, but persistent rain and the southerly flow make those outcomes less likely. The market’s emphasis on the 18–19 °C band therefore tracks the consensus that the day will be mild yet capped by the incoming maritime air mass. Updated model guidance late on 26 August will be the key near-term driver of any final shift in trader positioning.