Current forecasts from MetService and the Met Office indicate a maximum of 10–11 °C for Wellington on August 19 under persistent southerly flows and extensive cloud cover, which has anchored the 61.5 % implied probability on 11 °C. August climatology places the typical high near 12 °C, but recent polar-air intrusions have kept daily maxima at 10–11 °C, limiting daytime warming despite modest solar input. NIWA’s seasonal outlook supports near-average winter temperatures across the region, with model consensus showing strong winds and showers further suppressing peaks. Only a transient ridge would allow 12–13 °C, an outcome priced at just 21.5 % combined, while colder resolutions remain unlikely given the stable synoptic pattern. Updated model runs and official guidance issued in the next 24–48 hours will refine these probabilities ahead of market resolution.