Recent numerical weather prediction ensembles from agencies including INMET and global models indicate a high likelihood of maximum temperatures reaching or exceeding 23°C in São Paulo on May 17, driven by persistent subtropical high pressure and reduced cloud cover expected to enhance daytime heating. This positions the 67% market-implied probability for 23°C or higher as the dominant outcome, consistent with seasonal norms where May highs typically average near 23°C before cooling further into autumn. Minor probability mass on 22°C and below reflects residual uncertainty from incoming frontal systems that could increase cloudiness and lower peaks by 1–2°C. Updated model runs over the past 48 hours have reinforced this warmer bias, with limited divergence among guidance suggesting minimal downside risk to sub-20°C readings.