They are super light to move around the deck.  The metal frame does NOT get hot.  We live in Naples, FL and our heat is very serious.  We are talking about long days, long weeks and months of temperatures on the high 90s and you can easily grab the chairs from their frames and not feel them hot at all.
In the other hand, the mesh does get hot.  It is still mesh so it cannot really burn you but very hot nonetheless.  Our summer rains are literally daily and it is nice that water constant rain cannot damage the mesh and dry easily.  I wish they were just a tiny bit heavier.