Current ensemble forecasts from the China Meteorological Administration, ECMWF, and GFS models indicate Qingdao’s May 18 high will likely peak between 19–21°C under moderate southerly flow and variable cloud cover. The Yellow Sea’s cooler marine layer continues to moderate coastal readings, limiting strong daytime heating even as seasonal insolation rises. Historical mid-May baselines from official Qingdao stations cluster around 18–23°C, with recent cooler observations on May 15–16 reflecting persistent stratus and sea breezes that have compressed odds toward the middle of that range. Key variables ahead of resolution include afternoon cloud evolution and any late-model shifts in boundary-layer mixing, which could tip the exact high by 1–2°C.