**Trader consensus at 100% for a 21°C high in Warsaw on October 1 reflects converging real-time forecasts from multiple meteorological models, including GFS runs showing an afternoon peak near 20–21°C under clear to partly cloudy skies, light southeast winds, and high pressure near 1030 hPa.** Official guidance places the maximum well above seasonal norms of roughly 15–16°C, driven by warm advection and minimal cloud cover that permits strong daytime heating. With the market resolution tied to verified observational data, the near-certainty stems from tight model agreement and live station readings already tracking toward this value. Only an unexpected late-day surge or localized measurement variance could alter the outcome, though current conditions make such shifts improbable before the daily maximum is recorded.