This afternoon I went to put on one of my solar watches and nearly dropped it when I picked it up it was so hot. I had to leave it cool for a minute before it was comfortable to put on my wrist. The watch had been sitting on the window sill of a southerly facing window and it's been nice and sunny today.

However, considering it's only April it's going to get a lot hotter in the summer months, is there any chance of damaging solar watches by leaving them in direct sunlight or am I worrying about nothing?