Traders have converged on 30°C as the market-implied outcome for Warsaw’s highest temperature on September 9 because official station observations and forecast models aligned on a daytime peak near that threshold. High pressure, clear skies, and light winds supported strong solar heating, pushing afternoon readings to 29.2°C at the primary Warszawa monitoring site while nearby models briefly projected 30°C. This consensus reflects real-time data from national meteorological services rather than long-term averages. A modest revision in the final official maximum—due to station-specific timing, slight cooling from increased cloud cover, or measurement adjustments—remains the main scenario that could shift resolution away from exactly 30°C.