Forecast models from agencies including the Polish Institute of Meteorology and Water Management (IMGW) and international ensembles such as ECMWF and GFS converge on a daily maximum near 11°C for Warsaw on October 13, 2026, under cloudy skies, light winds, and stable high pressure that limits daytime warming. This aligns with climatological norms for mid-October and matches real-time observations showing afternoon peaks at or just below that threshold. The 99.8% market-implied probability on 11°C reflects trader confidence in this consensus, reinforced by consistent model runs and the absence of significant warm-air advection. Only a late-day surge in insolation or station-specific microclimate effects would realistically push the official maximum to 12°C or higher, scenarios assigned negligible probability given current atmospheric conditions.