hello, im visiting HK in october 17-21 may i know what is the weather? is it still warm?

Actually, from the late May, the weather of HK starts to become hot and humid. During that time, the average temperature could be about 25 C, sometimes higher.
Besides, the thunderstorm and frequent rain begin to fall. So you need take along the summer clothing as well as the rainy clothing.
By the way, you can pay much attention to the weatehr report then.