Recent China Meteorological Administration forecasts and global model ensembles indicate stable high pressure over the Yellow Sea through May 19, supporting trader consensus around 19–21 °C with closely matched implied probabilities. Qingdao’s coastal exposure creates a persistent marine boundary layer where sea surface temperatures near 12–15 °C moderate afternoon highs, typically shaving 2–4 °C off inland Shandong readings via onshore flow. Subtle differences in warm advection strength or cloud cover could tip the daily maximum between 19 °C and 21 °C, while stronger southerly surges remain unlikely given current steering patterns. Historical mid-May climatology places average highs at 19–22 °C, aligning with the market’s central cluster and underscoring the narrow uncertainty window ahead of final observational data.