I'm a native of the southwest US, so I know what some blazing hot weather is like.
I hadn't had a sunburn since I was 13, but I got a bad one when I spent a summer in the south of England at age 36.
Even though that country is at 55° north latitude, the air is so clean, the UV rays just fry you.
I was walking around over in London one trip over there. Heck, it was about 70 and felt cool so I put on my summer coat. I ended up packing that coat over my shoulders for the entire walk.