Recent National Weather Service and regional model guidance projects daytime highs in Miami near the upper 80s on May 17 under partly cloudy skies with light easterly flow, placing the market-implied probability near 80 percent for either the 86–87°F or 88–89°F bracket. Subtropical conditions moderated by Atlantic sea-breeze circulation and typical May humidity levels create narrow uncertainty in peak readings, while historical climatology shows an average high of 86°F with occasional excursions above 88°F when cloud cover or afternoon convection develops later than expected. Traders weigh these variables against the precise timing of maximum temperature observations at the official reporting station, where even modest shifts in model consensus could tip resolution between the leading outcomes.