Southern California here. Routinely triple digit heat and uber low humidity. Fabric pots work. As mentioned, you will want a larger one to hold moisture. 7 gallons will not likely be enough!
Here is my last photo grow in a 20 gallon. Amnesia Haze at 11+ feet tall and I should have used a bigger pot. Note the shade cloth wrapped around the pot to help with the evaporation.
PS - bug netting is your FRIEND on outdoor grows in the heat.
PSx2 - the good thing about fabric pots is if your plants outgrows the pot, you can literally cut the pot down the side, peel it off and replant in a larger fabric pot and they usually won't miss a beat.
EDIT - I was assuming that you were going Photo outdoors. But auto = same rules apply. I would go 10 gallon fabric along with anything else like the bug net. Shade cloth for the pot, etc.
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