Current National Weather Service guidance and ensemble model runs point to an overnight low of 78–79 °F at Miami International Airport on May 18, slightly above the 1991–2020 climatological normal of 74–75 °F. Persistent south-southeast flow off the warm Gulf Stream is limiting nocturnal radiative cooling while elevated dew points near 73 °F sustain a humid, stable boundary layer. With no frontal passage or dry-air intrusion expected through the 48-hour window, forecast confidence remains high that the minimum will settle in the upper 70s rather than the cooler 74–75 °F bracket. Traders are therefore pricing the 78–79 °F outcome as the modal outcome ahead of the final evening observations that will determine contract resolution.