Weather in Hong Kong in September 2025
Average weather
Average temperature in Hong Kong in September
The expected average maximum temperature in September is +29°C with a maximum of +32°C and a minimum of +23°C.
The average maximum temperature goes up 56% by the end of the month, compared with the beginning of the month, from +26°C to +31°C.
Is Hong Kong warm or cold in September?
Hong Kong is typically warm in September.
Maximum temperatures go up compared to the previous month from +29°C to +29°C. The minimum temperature also goes down from +25°C to +24°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Hong Kong, here is the comparison with other months:
Water temperature in Hong Kong in September
Water in Hong Kong in September is Very warm. It varies from +27°C to +30°C, with an average of +28°C. This is almost similar to the air temperature, which averages +29°C.
In September, water temperatures are average relative to the rest of the year:
Can you swim in Hong Kong in September?
Climate in Hong Kong in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +29°C | +29°C | +26°C | ||||
| Min. temperature | ||||||
| +21°C | +18°C | +12°C | ||||
| Max. temperature | ||||||
| +35°C | +34°C | +33°C | ||||
| Rainfall | ||||||
| 325 mm | 231 mm | 87 mm | ||||
| Wind | ||||||
| 2 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +28°C | +28°C | +26°C | ||||
| Humidity | ||||||
| 82% | 78% | 73% | ||||
| Air pressure | ||||||
| 1004 HPa | 1008 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 1 | 2 | 9 | ||||
| Cloudy days | ||||||
| 1 | 4 | 9 | ||||
| Rainy days | ||||||
| 26 | 22 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. The temperature levels stay the same in the area of +29°C for average maximum temperature during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 325 mm to 231 mm. It feels drier, as humidity decreases from 82% to 78%. Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average. The good news is there are likely to be more sunny days in September, from 1 to 2.
But maybe it is worth considering traveling in October as the weather gets better.
Wind
The average wind speed is 2 m/s getting up to 11 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Hong Kong is gradually decreasing during September, going from 11 m/s to 0 m/s over the course of the month.
Rain
How was the weather last September in Hong Kong?
Climate Change over Years
The climate in Hong Kong in September has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+23°C) and the highest in 2023 (+25°C). The driest year was 2011 with only 1147 mm of rainfall, and the wettest year was 2023 with 3151 mm.
FAQ
Is September a good time to visit Hong Kong?
Can you sunbathe in Hong Kong in September?
Can you swim in Hong Kong in September?
Is Hong Kong rainy in September?
Is it sunny in Hong Kong in September?
Monthly weather in Hong Kong
Source of the data
For this page, we’ve looked at the typical weather in Hong Kong, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.