Current forecast guidance from the National Weather Service and major models points to a high near 87–89°F in Dallas on May 18, driven by a southerly flow advecting warm, moist air from the Gulf under partly to mostly sunny skies early in the day. Scattered thunderstorms expected later could cap temperatures if cloud cover thickens, creating the tight clustering of market probabilities around 88–89°F while still leaving room for a brief push into the low 90s if heating accelerates before storms develop. This setup aligns with typical mid-May climatology for north-central Texas, where daily highs average 84–86°F but can exceed 90°F when subsidence strengthens ahead of a weak front. Traders appear to be weighting the narrow window between convective initiation timing and maximum solar heating as the decisive uncertainty.