just returned from Kos (see scooters), temperature was 125C , everyone wears shorts and sandals on the bikes, and 7 out of 10 people ride bikes. Speed limit is 50kms but road rash is road rash. Didn’thear of anyone coming off while I was there for 2 weeks.
I used to ride from Liverpool to Rhyl in T-shirt and cut down jeans on my 250N many moons ago. I remember doing 70 and a giant bumble bee hit me in the chest. I had a bruise on me tit for a week!
As for leathers in the hot weather I find that me keks (trousers to you)stick to me legs and I can’t get me leg over the Varadero without a run up. As Impdat says if riding unprotected watch your speed and be extra careful. Be Seen Be Safe.