Recent hourly observations from the Korea Meteorological Administration show Busan temperatures climbing to 27.7°C midday under partly cloudy skies and light easterly winds, aligning closely with the market's near-certain 28°C outcome. Forecast models from GFS and similar systems projected afternoon highs near 26°C, but real-time data and typical urban heat effects support trader consensus on this threshold. October climatology averages roughly 23°C for the city, placing current conditions modestly above baseline. Final official daily maximum reports could shift resolution if station-specific readings or rounding differ slightly, though afternoon peaks have already passed.