**Trader consensus has converged on 19°C as the official highest temperature recorded in Buenos Aires on September 8, 2026, backed by post-event meteorological observations.** Clear skies and stable high-pressure conditions allowed daytime warming to this level after morning lows near 9–10°C, consistent with Servicio Meteorológico Nacional and regional station data showing a peak around that value. Historical September averages for the city hover near 18–19°C maxima, providing climatological context that aligned with the observed conditions. With the date now past, market-implied odds reflect verified measurements rather than forecasts, though minor discrepancies in station selection or rounding protocols remain the only realistic paths to revision.