Current numerical weather prediction models from the European Centre for Medium-Range Weather Forecasts and NOAA project Madrid daytime highs for May 19 in the low-to-mid 20s Celsius under a stable high-pressure ridge with light southerly flow and minimal cloud cover. These conditions favor efficient daytime heating while limiting convective cooling, yet model spreads arise from subtle differences in boundary-layer moisture and exact timing of any weak frontal passage. Historical May climatology shows average maxima near 22°C, so the market-implied clustering around 26–28°C reflects traders weighting recent ensemble runs that allow modest warm-air advection from the Iberian interior. Resolution will hinge on official observations from AEMET stations, where even small forecast revisions in dew-point depression or wind speed could shift the recorded peak across the tightly bunched 25–29°C outcomes.