Trader consensus on the Taipei June 16 high clusters tightly around 29–31 °C because Central Weather Administration guidance and ensemble model runs continue to show a lingering Meiyu frontal boundary that favors persistent cloud cover and scattered showers, capping insolation and surface heating near the seasonal 31–32 °C climatological mean. Recent 48-hour model trends from ECMWF and GFS indicate modest warming if the front lifts northward by afternoon, yet spread in cloud-clearing timing keeps 30 °C only narrowly ahead of 29 °C in market pricing. Urban heat-island amplification in the Taipei basin adds roughly 1 °C to official station readings under partly sunny conditions, while higher humidity and onshore flow from the northeast monsoon can suppress the peak by 1–2 °C on overcast days. Updated CWA briefings and the next model cycle expected within 24 hours remain the key near-term catalysts that could shift implied probabilities before resolution.