Hai ..we are planning to go Hong Kong in September 23 to 29

Short T-shirts, skirts and shorts are suitable in September. In addition, you can take thin coats or jackets for nights or rainy days. The average temperature is from 25°C to 30°C. The dry and comfortable climate on sunny days is suitable for traveling. However, you may encounter frequent rainy days.

Tq for responding...is it the same more or less with the weather in shenchen and macau around those dates??thanks

They are nearly the same as the three cities are very close.

Ok..thanks a lot!