Recent southerly wind shifts and an approaching cold front are the main drivers behind the closely matched market odds for Wellington’s September 7 minimum, with traders balancing the chance of a sharp cool-down against milder northerly influences lingering into the weekend. Official forecasts highlight a transition to southeasterly flow on Monday, bringing widespread rain, higher humidity, and reduced diurnal warming that typically lowers overnight minima by several degrees compared with clear-sky baselines. Model runs show variability in the timing and strength of this change, creating genuine uncertainty around whether the lowest reading stays near the seasonal 8–9 °C average or drops toward 4 °C or below under stronger advection of cooler maritime air. Persistent cloud cover and precipitation further compress the temperature range, while any delay in the front could allow brief northerly warming to push the minimum higher. Updated MetService and international model guidance expected over the next 24–48 hours will clarify the precise steering pattern and help resolve the spread between the leading low- and high-temperature outcomes.