Recent official forecasts from MetService and aligned models project a high of 14°C for Wellington on August 22 under strengthening northwesterlies ahead of a frontal system, with showers possible but limited impact on peak daytime readings. These winds often produce localized warming through downslope effects over the Tararua Range, supporting the market's heavy weighting toward 14–15°C as the most probable outcomes. Ensemble guidance shows modest spread around this range, with recent high-pressure building easing prior cool southerlies and keeping temperatures near or slightly above the late-winter climatological average of roughly 12–13°C. Traders appear to assign meaningful probability to a 15°C reading if the warm advection strengthens slightly before the change arrives, while lower outcomes remain discounted absent a sharper southerly shift in updated runs expected over the next 48 hours.