Trader consensus on a 15°C high for Wellington on September 15 reflects real-time observations and model consensus from MetService and international sources showing peak temperatures stabilizing near that threshold amid northwesterly flow and partly cloudy skies. Official station data, including airport readings around 15°C (59°F) with dew points near 10°C, align with climatological norms for mid-September spring conditions in the region, where average daily maxima hover near 13–15°C. Strong market-implied odds capture this narrow range, as wind patterns and pressure gradients have prevented significant warming or cooling today. Resolution hinges on the final verified maximum from the primary reporting station; an unexpected late surge from clearer skies or a shift in steering flow could still nudge the outcome, though current model runs show low probability of deviation beyond 1°C.