Current MetService forecasts for Wellington point to a daytime maximum of 14°C on May 19, closely aligned with the market's leading 36% implied probability and the region's typical mid-autumn climatology of 13–15°C highs. Moderate southerly to southeasterly flow combined with persistent cloud cover is expected to limit solar heating and keep readings near the long-term seasonal average, while ensemble guidance from global models shows only modest spread toward a possible 15°C peak if winds ease or skies clear briefly. Traders are therefore balancing these stable baseline conditions against the small but realistic chance of slight warming or cooling depending on the final 48-hour model updates. Official observations from Wellington International Airport will resolve the market based on the recorded daily high.