Suggest Remedy For Fever Post A Day In Sun

Hello, my son is 20 months and we spend the day on the boat, in the sun, and ocean. He was wearing sun block, and he was kept in the shade as often as possible. He fell asleep for a couple hours and I also kept him in the shade. He seemed warm later that night and his temp was 101.2, I gave him IBprophren around 9 pm then checked at 1:30 am and it was 102.8. He had seemed a little tired, more than normal, but is not