Forecast models for Buenos Aires on July 21 indicate a likely daily maximum near 13–14 °C under a cool, moist airmass with light northerly flow and possible showers, consistent with mid-winter climatology where average highs reach about 15 °C. Recent observations show daytime peaks fluctuating between 13 °C and 16 °C, keeping the distribution tight. The market’s close spread across 13–15 °C outcomes reflects remaining uncertainty in exact timing of any brief clearing or wind shift that could add or subtract 1–2 °C, as well as model differences in boundary-layer mixing and cloud cover. Official guidance from regional meteorological services will resolve the market once the maximum is recorded.