Forecasts from multiple meteorological sources indicate Jinan’s September 29 minimum will likely fall in the 16–21 °C range, with official Chinese models and international guidance converging near 18–20 °C under partly cloudy skies and light southerly winds. Cloud cover and possible evening light rain limit nocturnal radiative cooling, while moderate humidity and breeze reduce the potential for sharper drops. These conditions explain the tight market clustering around 16–17 °C, as modest variations in overnight cloud thickness or wind speed could shift the observed low by 1–2 °C. Historical September minima in Jinan average near 15–17 °C, providing context for current trader positioning ahead of final observational data from local stations.