Recent forecast model runs from agencies including MetService and international ensembles point to a mild spring day in Wellington driven by northerly winds advecting warmer air masses, with afternoon peaks most likely reaching 16–18 °C. Variable cloud cover and possible early showers could cap daytime heating, while stronger northerlies or clearer skies would favor the upper end of that range; historical October maxima average near 17 °C but exhibit high day-to-day variability due to the region’s exposure to Tasman Sea systems. Traders are weighting the 17 °C and 18 °C outcomes most heavily because current guidance shows tight clustering around those thresholds, with limited downside risk below 16 °C unless a cooler southerly shift develops. Updated model cycles and official briefings over the next 48 hours will refine wind and insolation details ahead of resolution.