Recent short-range forecasts for Busan on September 2 show daytime highs clustering between 27–31°C amid 50–80% rain chances and variable cloud cover, creating genuine uncertainty in peak temperature. Incoming moisture and potential frontal influences or lingering monsoon effects limit insolation and cap afternoon warming, while lighter wind regimes or brief clear spells could allow brief spikes toward 30–32°C. Korean Meteorological Administration guidance and multiple global models align on near-normal September conditions (historical early-month averages near 27–28°C) but diverge on exact timing of showers, keeping market-implied probabilities balanced across 29–32°C. Updated model runs and official observations over the next 48 hours will likely resolve the narrow range before market close.