Recent forecasts from MetService, Met Office, and other models indicate a daytime high near 12°C for Wellington on August 20, consistent with near-average winter conditions per NIWA outlooks, following a period of cooler southerly flows and above-average temperatures earlier in the month. Trader consensus splits narrowly between 12°C and 13°C because small differences in forecast wind shifts across Cook Strait, cloud cover, or frontal timing can alter peak readings by 1°C. Southerly winds typically suppress maxima while northwesterlies allow slight warming, and model spread on these variables sustains the tight 46-42% implied probabilities. Updated official guidance on the 19th will likely refine resolution criteria for this short-term temperature market.