**Strong northwesterly winds and a clearing frontal system are the main factors shaping trader expectations for Wellington’s overnight minimum on August 23.** Models indicate the coldest readings will occur in the pre-dawn hours under partly cloudy to clearing skies, with radiative cooling limited by gusty conditions that mix warmer air aloft. Recent observations from Wellington Airport and MetService show the current airmass transitioning from a mild northwesterly flow, with temperatures already dropping toward 8–11 °C overnight on the 22nd. Consensus across guidance points to a minimum near 10–11 °C, consistent with the 41 % market-implied probability on 11 °C and secondary weight on 10 °C and 12 °C. Historical climatology for late August places the typical low around 8–9 °C, but stronger winds this cycle are expected to suppress further cooling. Key resolution thresholds hinge on the exact timing of clearing and any localized sheltering effects in the city basin. Updated model runs and official MetService forecasts over the next 12–18 hours will be the primary catalysts for any shifts in these probabilities.