Forecast models from major sources show Shanghai's June 13 high likely peaking near 27–28 °C, driven by an incoming weather system expected to deliver light rain, increased cloud cover, and southerly winds that limit daytime heating after hotter conditions earlier in the week. These factors reduce incoming solar radiation and enhance evaporative cooling compared with clearer, drier days when highs have recently reached 33 °C. Ensemble guidance shows modest spread in peak values depending on the exact timing and intensity of precipitation, which explains the tight clustering of market-implied probabilities around 26–29 °C. Updated model runs closer to the date will refine whether the maximum edges toward 29 °C or stays capped lower by more persistent cloud and rain.