An incoming cold front from the southwest is the dominant driver behind the market's overwhelming 99.7% implied probability for a 15°C daily maximum in Buenos Aires on August 17. Official forecasts from Argentina’s Servicio Meteorológico Nacional and supporting models indicate persistent cloud cover and light southerly winds will limit afternoon warming, keeping the peak near 14–15°C. This aligns with typical Southern Hemisphere winter conditions while the front introduces a modest thermal drop below August climatological averages of 15–17°C. Ensemble guidance shows limited spread, reinforcing trader consensus around the 15°C threshold. Minor uncertainty in exact peak timing or boundary-layer mixing could allow a 16°C reading if the front weakens or clears earlier than expected, though current observations make such shifts unlikely.