Persistent cloud cover and widespread rain expected across northern Taiwan on September 3, driven by an approaching low-pressure system and strong easterly flow, are the main factors capping daytime heating and keeping the highest temperature near or below seasonal norms of 30–31°C. Official Central Weather Administration guidance and ensemble models show highs of 27–32°C with 75–95% precipitation probability, while high humidity and reduced insolation limit peaks compared to clearer analogs. Trader sentiment clusters tightly around 30–32°C because model runs diverge mainly on exact rainfall timing and intensity rather than broader thermal trends, with uncertainty remaining until the next 48-hour forecast updates.