I will be traveling Taiwan on 20-28oct... what temperature?? is it very cold??

Which part do you want to go, Taipe or Tainan? There is differences between the two places.
In Taipe, the weather is OK. During the day time, the temperature is about 22 C and at night, it will be cool. So you need to take thin coats and long sleeved clothes.
In Tainan, the short sleeved clothes are OK.

I will be gg Taipei... Thanks for the infor...