We have been a couple of times during last week of October and first couple weeks of November. We found the crowds very manageable and the weather really great (i.e., not too much rain and temperatures in the low to mid 20's Celsius, probably low to mid 70's Fahrenheit). It will cool down the further you go into November, but I think November gets less rain and Thunder storms (on average) compared to October. You can also catch the Halloween decorations and party as well as the beginning of the Christmas season, if you time it right.