Hehe...cats love heat and sun. They have a totally different concept of "hot and cold". Keep in mind they aren't people and there bodies work differently than ours. They deal with extreme temperatures better than people. As long as a cat's coat isn't wet, they can manage in heat and very cold temperatures.
As long as your cat isn't panting, he's fine. If he's doing this, pull him into a cool room and offer him water. Don't be surprised if he doesn't drink right away, if he needs to, he will.
yah same here i have a male tubby persian cat and he loves to go out in the morning and even the temperature is hot he just stays outside.. dont know why..