**Latest official forecasts position a daytime maximum near 12°C as the most likely outcome for Buenos Aires on August 21, 2026.** Timeanddate and similar sources project a high of 53°F (11.7°C) under mostly sunny skies with light winds, following an overcast 61°F (16°C) day on August 20. This aligns with the market’s heaviest trading on 12°C (49.5%) and 13°C (37%), reflecting residual uncertainty in model runs about exact peak timing and any late-day warming. In mid-August, Buenos Aires experiences typical winter conditions with average highs of 15–17°C, but recent cooler air advection and increased cloud cover have suppressed temperatures several degrees below climatology. Key drivers include steering patterns from the South Atlantic high and any weak frontal passages that limit insolation and mixing. Historical analogs and current ensemble guidance show low probability of reaching 14°C or higher without a rapid shift in upper-level support. Traders are weighting the most recent numerical weather prediction updates, which favor the 11–13°C range while acknowledging forecast spread typical 24–48 hours ahead of resolution. No major data releases or model flips have occurred in the past 24 hours to shift the implied probabilities significantly.