**Forecast models from MetService and other agencies consistently project a maximum temperature of 12°C for Wellington on August 20, 2026, aligning with the near-average conditions expected for mid-winter in the region.** This consensus stems from stable atmospheric patterns following earlier polar air outbreaks that kept temperatures below typical levels in the first half of the month. Official outlooks from NIWA indicate temperatures most likely near the long-term August average of roughly 12°C, with light winds and partly cloudy skies limiting daytime warming. The market-implied odds reflect this strong alignment between multiple forecast runs and climatological baselines, leaving little room for deviation. Scenarios that could challenge the 12°C outcome include an unexpected late-day surge in northerly flow or clearer skies boosting solar heating enough to push the high to 13°C, though current model agreement makes such shifts unlikely before resolution.