**Wellington's winter temperature maximum on July 9, 2026, is tightly contested between 11°C (49%) and 12°C (44%) because recent model guidance and climatology place the likely peak squarely in that narrow band.** Wellington sits at the exposed northern end of Cook Strait, where southerly winds frequently advect cooler maritime air while strong gusts enhance mixing and limit daytime warming. Current forecasts from sources such as timeanddate and AccuWeather show a high near 11–12 °C under overcast skies with showers and winds exceeding 30 mph, consistent with NIWA’s seasonal outlook of near- or below-average temperatures for the central North Island region. Cloud cover reduces incoming solar radiation, while any frontal passage or wind shift can shave or add a degree to the daily maximum. Historical July highs cluster between roughly 11–14 °C, so the market’s near-even split between the two leading outcomes accurately reflects both forecast uncertainty in the final 48 hours and the physical variability typical of the strait’s dynamic boundary-layer environment. Newer model runs or observed wind trends on the 8th will be the key near-term drivers.