**Strong southerly winds and persistent rain are the dominant factors capping Wellington's expected maximum on June 27.** Official MetService guidance issued June 24–25 forecasts a high near 10°C under gale-force southerlies and widespread rain, consistent with cooler maritime air advection from the Southern Ocean that limits daytime warming. This setup typically suppresses maxima by several degrees compared with climatological June averages of 13–14°C. Traders have priced 11–12°C outcomes highest (combined ~69% implied probability), reflecting model uncertainty in exact timing and intensity of the southerly surge and possible modest warming if the front shifts or clears earlier than expected. Recent June warmth, including record highs early in the month, provides context for why probabilities remain spread rather than locked on lower values. Updated model runs and MetService briefings over the next 48 hours will provide the clearest signals ahead of market resolution.