Paint your pots white or another bright color. Or wrap them in foil, anything to reflect the sunlight off the pots. Also use a light colored mulch to slow evaporation and reflect the sunlight. You could even run shade cloth around a row of pots to keep the soil from heating up.
Your pots are too small for ollas, so the self waterers that you put bottles on would keep the soil from completely drying out during the day. Sorry, I'm on the iPad, and don't have the links. I'll get those later.
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