Forecast models from agencies like NIWA indicate Wellington daytime highs near 13–15°C for August 12, with near-average conditions favored amid emerging El Niño-driven southwesterly flows that often suppress temperatures through stronger winds and increased cloud. The tight 46.5% split between 14°C and 15°C reflects uncertainty in local factors such as wind direction—northerlies can add 1–2°C via warmer advection while southerlies enhance cooling and mixing—along with frontal passage timing and solar heating under variable marine layer cloud. Historical August maxima average around 13°C, but short-term model runs show modest warming potential if high pressure builds briefly. Updated NWP guidance and surface observations over the next 48 hours will likely resolve the narrow gap between these outcomes.