Hi,
Pot too small, nutrients depleted, roots cooked from the sun, lack of water, and rootbound .
You should have up potted beginning of August to keep them on track.
I'd do it asap, or they'll get in a worst shape, and may die.
Of course, with some more water you could sort of keep them alive. But for that size, they just need a bigger pot to keep on growing. They can use one liter of water every day with that size and the current summer heat .
I have some like that that are still happy ... Because the roots escaped the pots and are now in the free dirt underneath ... Call it cheating ! Call it adapting to a less than ideal situation .