Forecasts from the Hong Kong Observatory and global models show early September daytime highs typically near 30°C under a broad low-pressure trough bringing unstable conditions, cloud cover, and scattered showers or thunderstorms across the region on September 1. These factors limit strong solar heating and support a narrow temperature range centered on 29–31°C. Recent model runs and climatological baselines for the period reinforce this cluster, with precipitation probabilities of 40–70% potentially capping peaks below 32°C while preventing sharp drops. Trader consensus, reflected in the 37.5% implied probability on 30°C, aligns with this evidence-based outlook amid standard forecast uncertainty in short-range guidance.