Trader consensus centers on 27–29°C for Chengdu’s August 19 high because the latest China Meteorological Administration and global ensemble runs show only modest spread around that range, shaped by variable afternoon cloud cover, scattered convection, and steering influences from the East Asian monsoon. Late-summer humidity and frequent brief showers typically suppress peak readings below mid-August averages near 32°C, while clearer breaks could allow brief warming. Historical late-August climatology supports this band, and the market’s tight clustering around the mode reflects traders’ assessment of these near-term atmospheric controls rather than any single extreme driver. Resolution hinges on official daily maximum observations, with final model guidance expected within hours.