**Recent northerly winds have delivered milder air to Wellington ahead of a trough and southerly change, keeping the Aug 27 maximum forecast near the long-term seasonal average of roughly 13–14 °C.** Official guidance from MetService and international models (ECMWF, GFS) shows the high likely falling between 12–14 °C, with 13 °C and 14 °C dominating market pricing at 40.5 % and 46.5 % respectively because small differences in cloud cover, rainfall timing, and the precise arrival of the southerly flow can shift the peak by 1 °C. Key differentiating factors include the strength and timing of the wind shift from northwest to southerly (stronger or earlier southerlies favor the lower end), daytime cloud thickness that limits insolation, and any light rain that adds evaporative cooling. Current runs cluster around 13 °C under mostly cloudy conditions with a 40–50 % chance of showers, while any delay in the front or more broken cloud could allow brief warming toward 14 °C. Updated model runs and official briefings in the next 24–48 hours will narrow the range and likely move the tightly contested 13–14 °C probabilities.