The highest day temperature in September 2025 was 91°F. The lowest night temperature was 82°F. The average values for day and night temperatures during September were 87.8°F и 85.1°F respectivly.

The average sea surface temperature in September 2025 for Hong Kong was 88.3°F. The maximum and minimum values were 85.6°F and 90.0°F respectively.

Most of the days in September are cloudy but you can also expect sunny or gloomy days.

Precipitation total in September for Hong Kong is 4.2 in.

The average wind speed in September is 8.3 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Hong Kong in September is 7.3 hours.