Hong Kong weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: October – February
What is the weather like in Hong Kong in September?
In September, Hong Kong is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.4 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. It rains often – on about 17 days, adding up to 215 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Hong Kong.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 44 | 50 | 87 |
| Day | 30° | 29° | 27° |
| Night | 26° | 25° | 23° |
| Sea | 29° | 28° | 27° |
| Sun | 6 h | 7 h | 7 h |
| Rain days | 24 | 17 | 8 |
More details for September
- Daylight
- 12 h 18 min06:10 – 18:28
- UV index
- 11 · extremeclear sky, noon (estimate)
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 15 km/haverage daily peak
- Cloud cover
- 61 %on average
- Hot days
- 8 days30 °C or more
- Time zone
- UTC+8Asia/Hong_Kong
How the score comes together
- Temperatureweight 50 %74 %
- Sunshineweight 20 %60 %
- Few rainy daysweight 30 %4 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Hong Kong in September: quick answers
Is Hong Kong hot in September?
Yes. In September, Hong Kong is hot: daytime highs average 29 °C and nights stay around 25 °C. On about 8 days the thermometer climbs to 30 °C or more.
Can you swim in Hong Kong in September?
Yes. In September the sea averages 28.4 °C – lovely and warm for swimming.
Does it rain much in Hong Kong in September?
It rains often – on about 17 days, adding up to 215 mm.
Hong Kong month by month
The whole year in Hong KongAll destinations: Hong Kong
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)