I’ll be honest I never planned a day for photography unless I’m on holiday. And it can lead to a major or serious event like dehydration and heat stroke. I had several minor dehydration, heat stroke incidents and sunburn because I didn’t take enough water and I didn’t have a hat or put sun block/cream on. a few pointers;
1, take plenty of water
2, take a hat to protect your head
3, wear comfortable clothing like breathable and baggy to allow the air circulate like a t-shirt and shorts
4, put sun block/cream on to protect your unveiled skin, too much sun burn may cause skin cancer
5, you can wear sunglasses but the problem is that they show you a different vision than the camera.
6 avoid going out or shelter in shadows between 11am and 3pm (1100-1300) that is when the sun is at its highest and strongest point of the day during the summer season.
These are just advice for going out in the sun with/without a camera so be careful and look after yourself in the sun since it can be both friend and foe.