National Weather Service observations at Miami International Airport recorded a minimum of 78°F early on June 15, 2026, aligning precisely with the 78-79°F bracket that commands essentially 100% market-implied probability. Persistent subtropical high pressure and light southerly flow maintained typical early-summer overnight minima in the upper 70s, matching AccuWeather and NWS model consensus that placed lows near the June climatological average of roughly 76–80°F. Forecasters noted no incoming cold fronts or significant moisture shifts that might have depressed readings further. A sudden nocturnal thunderstorm complex or station-specific microclimate anomaly could theoretically shift the official value by a degree or two, but such events remain statistically rare in mid-June and would need to overcome the broad model agreement observed in the days leading up to the date.