Desirai,
When the night temperatures drop 60F & lower, you are better to bring in to be safe. They may be alright if soil is very dry and plant protected. With having 3 plants, I would bring inside. Your daytime temperatures at 80-90 F
are perfect for them, if you where able to have outside in day and in at night.
Hope this helps to answer some of your questions.
Rick

thank you very much! :) I love my little adenium babies!