Forecast models from agencies like the China Meteorological Administration indicate Shanghai's June 15 maximum will likely peak in the mid-20s Celsius amid the East Asian summer monsoon and mei-yu rainy season, where persistent cloud cover and scattered showers suppress daytime heating. Recent ensemble runs show high uncertainty between 24–27°C due to variable timing of precipitation, boundary-layer moisture, and weak steering winds, explaining why traders assign the highest implied probabilities to 25°C (36%) and 26°C (28.5%). Historical June baselines average near 27°C, but current conditions favor slightly cooler outcomes; updated model runs over the next 24 hours will clarify whether any clearing allows brief warming toward the upper end of that narrow range.