Recent forecast model runs from New Zealand’s MetService and NIWA place Wellington’s September 26 maximum temperature squarely between 14–15 °C, driving the near-even market split. Subtle differences in predicted cloud cover, northerly wind strength across Cook Strait, and the timing of any sea-breeze development account for the narrow gap between the two leading outcomes. Historical September maxima average near 15 °C, but current guidance shows limited diurnal warming under variable spring conditions. Traders are watching the next model update and late-day observations for any shift that would tip the balance between these adjacent thresholds.