Trader sentiment for Taipei's June 15 maximum clusters around 28–30°C due to persistent East Asian plum rain (Meiyu) patterns, which bring extensive cloud cover and scattered thundershowers that limit solar heating and cap daytime peaks. High humidity near 80% combined with light winds reduces the diurnal temperature range, while the urban heat island effect in Taipei provides a modest boost. Ensemble forecasts from Taiwan’s Central Weather Administration show tight clustering near 29°C, with minor divergences in convective timing and cloud thickness creating the spread across 28°C, 29°C, and 30°C outcomes. Updated short-range model runs expected in the next 24 hours will likely refine these probabilities before resolution.