Current National Weather Service and private model guidance for Miami on May 17 centers on a high of 84–86 °F, with afternoon sea-breeze convergence and scattered thunderstorms expected to cap daytime heating. These conditions reflect typical late-spring subtropical patterns in South Florida, where high humidity and onshore flow moderate temperatures while increasing the chance of convective cooling by mid-afternoon. The market’s tight spread across 84–89 °F outcomes mirrors the modest uncertainty in timing and coverage of showers, which can shift the daily maximum by a degree or two. No significant warm or cool air advection is forecast, keeping probabilities concentrated near the climatological normal for mid-May. Updated model runs tonight will refine shower timing and could quickly shift trader positioning ahead of market resolution.