Current forecasts from major models indicate Shanghai's minimum temperature on August 21 will likely fall in the 25–27°C range, shaped by persistent subtropical high pressure, high humidity, and scattered thunderstorm activity that limits nocturnal cooling. Official guidance from sources such as the China Meteorological Administration and global ensembles shows little change from recent days, with overnight lows remaining elevated due to warm advection and urban heat effects rather than any incoming frontal system. Historical August climatology places typical daily minima near 26°C, providing context for trader expectations. Model runs through the weekend will refine wind patterns and precipitation timing, which directly influence how low readings can drop before sunrise on the 21st.