**Trader consensus has locked onto 18°C as the day's maximum temperature in Warsaw, reflecting confirmed observational data from official meteorological stations.** On October 4, 2026, surface measurements aligned with this value amid mild autumn conditions, with daytime highs supported by westerly flow and partial cloud cover that limited further warming. Multiple forecast models had projected peaks near 19–21°C (66–70°F), consistent with climatological averages for early October, yet the verified high settled at 18°C. This outcome carries near-certainty because resolution depends on standardized station readings rather than models or forecasts. Only an unusual post-event data revision or discrepancy in the chosen reference station could alter the result.