National Weather Service forecasts for Miami International Airport indicate a high near 84–85°F on May 18 under partly to mostly cloudy skies with a chance of afternoon showers and thunderstorms, driven by persistent southeasterly flow and increasing Gulf moisture. These conditions introduce uncertainty around peak heating, as cloud cover and storm timing could cap temperatures in the mid-80s while clear intervals allow brief rises into the upper 80s. Historical May averages hover near 85°F, but recent observations of 92–93°F highs have kept trader focus on the 84–89°F range where model consensus remains tightest. Final NWS updates and radar trends over the next 48 hours will clarify whether afternoon convection suppresses or permits the higher end of that band.