Current numerical weather prediction models and MetService guidance indicate a maximum temperature near 15–16°C for Wellington on June 21, driven by a mild northerly flow advecting warmer air over the region amid typical wintertime westerly influences and variable cloud cover. Historical June maxima average 12–13°C, so any positive anomaly depends on limited mixing from Cook Strait winds and reduced radiative cooling under partly cloudy skies. The close market spread between 15°C and 17°C reflects minor ensemble disagreements on frontal timing and wind speed, with 16–17°C outcomes favored if northerlies strengthen as some runs suggest. Updated model cycles and official briefings over the next 48 hours remain the key variables that could shift implied probabilities before resolution.