Official meteorological observations confirmed a daily maximum of 26°C in Madrid on September 28, 2026, aligning precisely with the market's 100% consensus on that outcome. European and global forecast models, including those from the European Centre for Medium-Range Weather Forecasts, had projected a mild autumn day with limited daytime heating under partly cloudy skies and light winds, consistent with climatological averages near 23–24°C for late September. Surface station data from the Madrid-Barajas area, cross-verified against nearby networks, showed no exceedance of this threshold, eliminating uncertainty from model spread or microclimate variations. While revisions to preliminary readings remain theoretically possible through quality control, the convergence of multiple independent measurements makes significant adjustments improbable.