I will stay in Macao september-january. Is it like the continental European fall or more hot?

It will not rain a lot like the continental Europea. The average temperature for the whole year is around 22C. The coldest time is the Jan. and the average temperature is around 10C and the hottest time is around July with average temperature around 28.6C.
It will become hot from May.

For days with degrees over 25C, it usually happens in summer time. Sometimes, the highest temperature will reach around 35C.