Watering in summer

What are Mediterranean climate gardeners' views on the time of day to water plants.  We need to water our new plants here in Spain for their first year over the dormancy period in our hot dry summer until they get their roots down.  I was always led to believe the best time for these new plants to get most benefit was watering in the evening and so the ground would stay damp all night until morning.  Lately, I have had some interesting discussions  about watering in the evening and there are some theories that it is not as beneficial to the plants as early morning (7-8am) watering because in the evening the ground is still hot from the baking sun. 
 
Watering in the early morning  when the ground is relatively cold is apparently more beneficial for the roots.  Do you agree?
 
I would love to hear your experience and advice. 
Best wishes
Pamela 
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