wistyfields wrote: Is there weather when it's too hot for walking?
Yes, it is possible to get heat exhaustion (yes, even in Scotchland the Dreich!), also eye problems from strong sunlight, particularly if reflected off water. Malignant sunburn can be very painful and debilitating, and of course with the hot weather come the biting insects. Pray for cloud and a strong breeze! I was at Loch Etive yesterday, there was a good strong breeze which kept the midgies away.