Thanks for using HCM, I understand your concern and will try to give you my medical advice, I think tha he needs avoid or minimize the sun effects applying this tips: drink different beverages no only water to replaced his body lost salt or electrolytes because just water is insufficient to keep a right hydration about his hot skin is normal because he had a long exposure to the high temperature, does not mean that he has fever ( although fever is a symptom of dehydration) I advise that he needs to wear a fresh clothes like cotton ( no lycra or nylons) with light colors because the dark colors retain the sunlight, dark glasses and sunscreen (UVA) is really important that he covers his head all the time. I hope that my advice has been helpful,take care