At what point should I make my toddler come inside?

It is about 95 degrees outside. I came inside because I was roasting. He has sun block on, and he was mostly staying on the porch where it is in the shade, but still he's getting awfully flushed from the heat. He usually eats his afternoon snack at the table out there, but it was hot so I brought it inside hoping he would follow it in, but it didn't seem to help. I usually just let him play outside all afternoon because he is far happier out there and I don't have to deal with the dozens of tantrums there always are when he's playing inside. Should I bring him in to protect him from the heat, or just let him play and be happy?