**Wellington's overnight minimum on August 30 is expected to fall in the 8–12 °C range under clear to partly cloudy skies and strong northwesterly flow.** Multiple forecast models show daytime highs near 15–16 °C with dry, windy conditions (NW gusts 25–35 knots), followed by radiational cooling after sunset. The precise low depends on wind mixing, dew-point depression, and any thin high cloud that reduces outgoing longwave radiation. Trader sentiment clusters tightly around 9–11 °C because ensemble guidance shows only modest spread in boundary-layer temperatures once the strong gradient wind prevents extreme surface decoupling. Stronger sustained NW winds favor the higher end (11–12 °C) by limiting nocturnal cooling, while lighter winds or brief clear spells could allow the mercury to dip toward 8–9 °C. Historical late-August climatology for Wellington places the typical minimum near 8–10 °C, so current model consensus sits slightly above average but within normal variability. No major synoptic shift (such as a cold front or blocking high) has emerged in the past 48 hours to alter the baseline, leaving the market-implied odds reflective of genuine forecast uncertainty rather than a single dominant driver.