**Trader consensus on the Polymarket for Chengdu’s highest temperature on June 11, 2026, has converged at 28°C with near-100% implied probability.** This positioning reflects climatological norms rather than short-term anomalies. June averages in the Sichuan Basin place typical daily highs at 28–30°C, with early-month values often near the lower end of that range according to long-term observational records. Current model guidance and real-time monitoring show no strong warming signals, such as anomalous subtropical ridging or reduced cloud cover that would push maxima above 29–30°C. Local factors reinforce stability: the basin’s frequent morning fog and humidity limit daytime heating, while urban heat-island effects in Chengdu remain modest on typical June days. No official advisories from Chinese meteorological agencies indicate heatwave conditions or record-challenging warmth for this date. The tight clustering around 28°C therefore represents traders’ assessment of baseline seasonal conditions holding steady. Realistic challenges would require an unexpected late surge in solar insolation or a shift in regional steering patterns—developments that would appear first in updated numerical weather prediction runs. With the market date now live, any revision would hinge on the final verified maximum reported by authoritative stations.