September weather forecast
Hong Kong

September in Hong Kong marks the transition from the hot, humid summer to the more temperate autumn. The temperatures begin to decrease slightly, with average lows around 26°C (78.8°F) and average highs reaching approximately 30°C (86°F). The extreme heatwaves of the summer months become less common, making the city more comfortable to explore.

The variations in weather conditions across Hong Kong remain minor, but the outlying islands and hilly regions might experience slightly cooler temperatures than the downtown and urban areas, due to their geographical location and altitude.

September sees a substantial decrease in rainfall compared to August, with average precipitation around 250mm (9.84"). While the city is still technically in the typhoon season, the frequency of storms begins to lessen, and the weather gradually becomes less humid.

As the city transitions into October, the weather continues to cool, with temperatures dropping to an average of 22°C (71.6°F) to 28°C (82.4°F), and rainfall further decreases to 100mm (3.94"). Despite the decreased rainfall and slightly cooler temperatures, September is still a warm month in Hong Kong. Visitors are advised to dress in light, breathable clothing and be prepared for the occasional rain shower.

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• Tai Po - September »
  As September unfolds, the intense heat of August gives way to somewhat milder days, although humidity levels remain high. September in Tai Po, Hong Kong witnesses the initial signs of seasonal change, with a gentle decline in temperature and a slight drop in rainfall levels.
• Hong Kong - September »
  In Hong Kong, during September, the rain falls for 14.7 days and regularly aggregates up to 328mm (12.91") of precipitation. In Hong Kong during September, the rain falls for 14.7 days and regularly aggregates up to 328mm (12.91") of precipitation.
• Tin Shui Wai - September »
  In Tin Shui Wai, in September, during 22.7 rainfall days, 150mm (5.91") of precipitation is typically accumulated. The months with the highest UV index in Tin Shui Wai are May through September, with an average maximum UV index of 7.
• Kowloon - September »
  In Kowloon, in September, the average water temperature is 28.3°C (82.9°F). In September, the average sea temperature in Kowloon, Hong Kong, is 28.3°C (82.9°F).