Recent forecast models from sources like the Met Office, WindBorne, and Yr.no indicate overnight lows for Jinan on September 21 clustering between 17–21°C, with light northeasterly winds around 3–6 km/h and variable cloud cover (50–80%) moderating radiative cooling overnight. Slight model differences arise from expected drizzle chances (under 20%) and dew point forecasts near 14–18°C, which can suppress the minimum by limiting clear-sky heat loss. These variables create tight clustering around 16–19°C in trader-implied odds, as even modest shifts in boundary-layer mixing or timing of any cloud breaks could tip the recorded low by 1–2°C at official stations. Historical September minima in the region often fall near 16–18°C under similar transitional patterns.