Mark, do you need boots? What do the old guys looking after sheep and goats in the hills wear? Bit like over here, farmer John goes off in his £10 Dunlop wellies hiking the hills and the bushcrafter goes off in his ubertech boots.
Your feet will get hot in whatever boots you use, especially in a Greek summer so have you thought about good sandal's?
To be honest mate i have absolutely no idea what sheep and goat herders wear over here, the few i've come across generally tazz around on them there quads in trainers.
Problem with wellies and the like is i usually average just under 80km a month hiking/walking the dog.
That's around 130 hours a month, many of which are over VERY rough sections that you can't really call paths, best way of describing them is that they resemble lava fields in their ability to rip what ever stands on them to shreds.
On the sections where we go really "off piste" i even have to put little boots on the dog as she has ripped her paws to pieces on those sections on previous hikes they're THAT sharp.
So wellies would be an absolute nightmare.
Don't get me wrong if times were tough i'd hike in what ever footwear i had available, but i've worked hard, saved, invested and looked after my money my entire life, to get to a point where i'm ok financially, so i have no reason not to invest a bit of that money on in a decent pair of footwear to do something i love.
With regards to my feet getting hot.
Yep your right in July and especially August, every single point on your body is sweating, even places you didn't know you had sweat glands.

There is a difference between being hot though and parts of your body (feet in this case) being past the point of uncomfortably hot.
I've tried sandals, as i say i spend more time picking stones out between the soles of my feet and the sandal than actual walking.
They also restrict the paths i can walk on, as on the rough stuff you'd tear your feet to pieces in sandals (again this lava fields).
I've tried various trainer type shoes and they're great, in that my feet just remain hot rather than uncomfortable hot.
But again wearing trainers means:
a/ I feel nervous about going on certain paths, from lack of ankle protection and support
b/ That near the end of my longer hikes when i'm basically throwing one foot in front of the other from fatigue, and trainers offer no ankle support when i stumble.
c/ The soles tend to be soft, which i find very uncomfortable after a hour or so of striding from the top of one pointy rock to another.
Don't get me wrong i can and have hiked these paths in everything from sandals and 5fingers through to most of my trainers.
I've also twisted my ankle, ripped my ankle to pieces and limped home from bad feet.
So if i can find something to make hiking a little safer and little more comfortable, why not?
Ideally i'd want.
A boot
Mesh uppers that breath really well
Stiff sole
If a tall boot no lace hooks on the top section of the boot as they make tieing the laces a nightmare
Love those boots (engineer's boots) My Dad used to wear them driving heavy equipment. They're quite popular among heavy equipment operators (operating engineers) as well as RR engineers, and they're EXTREMELY popular with hardcore bikers over here. Unfortunately they're not really intended for walking. Although I gotta admit my Dad used to cover miles and miles in them while quail hunting but I wouldn't want to do it. Especially now with my 55 year old, diabetic feet.
I'd reccomend some type of jungle or desert boot for what the OP asked. I like Magnum High Techs (or any good quality similar boot) but I don't generally have much trouble with the heat. It gets hot here in (the temps you describe are our Spring/Fall temps & upper Winter temps) but it just doesn't really bother my feet. Ankle support isn't really a big deal here either in Florida but I did well enough with the same style boots out West also (Rockies and Sierras) so they should probably do well in Greece.
Plus 1 to Rik_UK_3's suggestion too; check what the locals are wearing.
I'll take a gander at those magnums thanks mate.
Problem with looking at the locals is that i do not know any local that hike at all, never mind most days.
My Mrs is local and she's wearing slippers most the time i'm out hiking
I'm NOT wearing a bloody dress
No idea why they still wear those clogs, i've seen them go **** over tit numerous times.
Thanks guys.
Please keep the suggestions coming
