**Trader sentiment for the highest temperature in Wellington on August 11 centers on a narrow range between 12°C and 13°C, reflecting closely aligned forecast guidance from regional models.** Wellington’s August climatology features average daytime maxima near 12–13°C, driven by cool Southern Ocean air masses, frequent southerly flows, and the city’s exposed coastal position that limits daytime warming even under partial sun. Short-range forecasts valid for the date show maximum temperatures of 12–13°C under mostly overcast or broken conditions with light winds, keeping the daily peak modest. Minor model differences arise from the exact timing of any weak frontal passages or shifts in wind direction—northerly flows can briefly add 1°C of warmth, while stronger southerlies or increased cloud suppress it. With resolution imminent, traders weigh the latest NIWA and international model runs, where the balance of evidence favors 12°C as the most probable outcome but leaves room for a 13°C reading if daytime mixing strengthens slightly. Lower probabilities for 11°C or 14°C+ capture residual uncertainty from potential forecast adjustments in the final 48 hours.