Current ensemble forecasts from regional models place Chengdu's June 18 maximum near 30–31 °C under typical early-summer monsoon flow, with the tight clustering of market-implied odds around those bins reflecting genuine uncertainty in afternoon boundary-layer heating and possible scattered convection. Recent guidance shows modest warming from upstream high pressure but also elevated humidity and cloud cover that can suppress peak readings by 1–2 °C, while clearer slots could allow brief excursions toward 32 °C. Historical June climatology centers on 28–30 °C highs, so traders are weighting the latest short-range model consensus and expected diurnal temperature range against the chance of timing shifts in any showers. Updated runs from official agencies over the next 48 hours will likely tighten resolution odds.