I don't generally find the heat a problem, even in August, as there are so many opportunities to cool down in Disney parks.
October starts to get cooler from the middle of the month. No humidity and little rain. I needed a cardigan for the evenings though, as the air temp is cooler but air con is still on so there's no chance to warm back up lol. It's just right though early to mid Oct IMO.
Never been in feb though!