Recent numerical weather prediction runs from models like ECMWF and AEMET show ensemble spreads centered on 37–38°C maximum temperatures for Madrid on August 1, consistent with the near-even market-implied odds for those outcomes. A persistent subtropical high-pressure ridge is promoting subsidence, clear skies, and strong daytime insolation across the Iberian Plateau, while light northeasterly flow limits advective cooling. Late-July observations at Retiro station (32–37°C) provide a warm baseline, but small differences in boundary-layer mixing, soil moisture, and urban heat-island effects can shift the peak by 1–2°C. With resolution two days away, traders are weighting the latest high-resolution model updates and AEMET guidance, which continue to bracket the most likely values near 37–38°C.