Clear skies and light northeasterly winds under high pressure are keeping Jinan’s overnight radiative cooling efficient on September 1, with forecast models and local observations converging on a daily minimum near 17–19 °C. Dew points around 15–17 °C and minimal cloud cover support modest nocturnal drops from daytime highs of 30–31 °C, while the absence of frontal systems or stronger winds prevents either sharper cooling or mixing that would raise the low. Slight differences among 17 °C, 18 °C, and 19 °C outcomes reflect small variations in model timing of the minimum, urban-station siting, and the final official reading from the China Meteorological Administration network, leaving traders with closely matched probabilities reflecting genuine forecast uncertainty at the end of the day.