Trader consensus on Polymarket reflects tight uncertainty in National Weather Service and model forecasts for Miami's March 27 high temperature, with 82-83°F leading at 35.5% implied probability closely trailed by 80-81°F at 29.5%, driven by ensemble guidance from GFS and ECMWF showing peaks between 81-83°F under high-pressure ridging and light southerly flow. Differentiating factors include potential marine layer persistence cooling coastal stations to 80-81°F versus diurnal heating and elevated sea surface temperatures pushing toward 83°F in clearer scenarios. Historical late-March averages near 80°F provide baseline context, but recent model runs highlight 2°F spreads amid typical forecast uncertainty. Afternoon NWS updates and evening model refreshes will likely sharpen this razor-thin divide.