Recent model consensus from global ensembles and regional forecasts positions 30–32°C as the leading outcomes for Shanghai’s August 19 maximum, reflecting the typical late-summer decline under a weakening subtropical high and increased cloud cover or scattered showers. Current runs indicate daytime highs near 31°C, with modest uncertainty from potential convective activity that could suppress temperatures by 1–2°C or allow brief clearing to push readings slightly higher. Historical climatology shows mid-to-late August averages around 30–31°C with high humidity and frequent precipitation, while recent observational trends through mid-August have remained close to these baselines without major heat-wave signals. Updated short-range guidance over the next 48 hours will likely refine the distribution across the 30–32°C bin.