Recent forecasts for Jinan indicate overnight lows near 19–22°C on September 19, reflecting a balance between lingering summer warmth and early autumn cooling. High-pressure ridges have promoted clear or partly cloudy skies and light winds, limiting radiative cooling while daytime highs reach 31–32°C. Model spreads arise from subtle differences in humidity, cloud cover, and steering patterns that affect minimum temperatures. These conditions explain why traders assign roughly equal weight to extremes of 12°C or below versus 22°C or higher, with mid-range outcomes like 17–18°C capturing uncertainty in nocturnal heat retention and frontal influences. Updated model runs and official observations will clarify resolution thresholds in coming hours.