MetService's latest morning forecast projects a daytime high of 18°C in Wellington Central, with northwesterlies strengthening to strong in the afternoon and a chance of showers developing later, driving trader consensus to favor this outcome at 40.5% implied probability over 19°C at 35%. The narrow margin stems from short-range forecast uncertainty around shower onset timing and cloud cover extent, which could curb solar insolation and cap peaks below 19°C at the exposed Wellington International Airport station, versus prolonged morning sun under the mild nor'westerly flow pushing slightly higher. April averages near 17°C provide baseline context, but model ensembles show a 17–19°C spread amid inherent variability in wind-mixed boundary layers. Observations begin resolving the market today.