Hey Pedro,

I experienced riding in extreme heat in Rajasthan in India last April. Around 43 degree C in the shade and it was TOO MUCH in the sun. I had to leave early and stop by around 10.30 in the morning or risk passing out while i was riding. There's an opposite to wind chill and with your body's core temperature being only 36 degrees i find it hard to see how it keeps functioning in such heat, but it does by sweating lots, so as Charlie says dehydration is a real problem. The danger is that you are not in the habit of drinking more so you might not drink enough. Just make sure you do and adding some rehydration salts to your water wouldn't hurt if you can find some nice tasting stuff!

As for Morocco, I was there last year from mid September and if anything it was already 'out of season' and getting too cold then, certainly for the Atlas. It seems like mid summer is the only time to get the best of the weather in the mountains. North of the Atlas has pretty much a European climate but even south doesn't seem to be as hot as you'd imagine and if you're from Portugal i wouldn't let it worry you so much that you don't go. If it's too hot in the sand go up to the mountains! Er Rachidia is around 1000m altitude and you can ride down to Erg Chebbi in a morning to test it out. If it's unbearable head back up the next day. Sand storms permitting Besides if you want to go to the desert you've got to have a bit of heat. You've going to experience it sometime if you're planning on a big trip, best to know ahead how bad it can get.

Have fun
Neil