Trader consensus on a 21°C high for Warsaw on October 1 reflects real-time observational data from regional weather stations under a stable high-pressure ridge, with light southeasterly winds and mostly clear skies supporting daytime warming to that exact threshold. Multiple forecast models converged on a maximum near 20–22°C, aligning with the climatological range for early October while current surface observations confirm the peak. This skin-in-the-game market pricing incorporates the low likelihood of significant model error or measurement adjustments on resolution day. A realistic challenge would require an unexpected late surge in cloud cover or wind shift that caps temperatures below 21°C, though such revisions remain improbable given the consistent data.