Stable high-pressure ridge over the Iberian Peninsula has kept ensemble forecasts from the European Centre for Medium-Range Weather Forecasts and Global Forecast System tightly clustered around a 22–23 °C daily maximum for Madrid on May 17, producing the current market-implied odds that place these outcomes first and second. This synoptic pattern suppresses strong daytime heating by maintaining subsidence and limiting moisture advection, consistent with May climatology where average highs near 22.6 °C serve as the baseline. Minor model spread remains on boundary-layer mixing and local urban heat-island effects, yet no significant perturbations have emerged in the past 48 hours to shift consensus. Final resolution will hinge on official observations from the Adolfo Suárez Madrid–Barajas station, with any last-hour changes in cloud cover or wind the only variables that could push the reading outside the leading bin.