hey there so basically what happened is that the temperature rising made the humidity rise which affected the Vapour Pressure Deficit (VPD) and this made the metabolism go too fast so plant sucked up more liquid from the ground than usual and basically you got nutrient burn as well as a magnesium problem because of the heat. Magnesium deficiency is easy to spot from the yellowing between the veins, the color of the stems (purpling) and the way the sides of the leaves burn. You for sure dont have pH problems and for sure no phosphorous deficiency lol. Since you're outdoors you have to work a bit different than normal and the name of the game is called "keep the root zone cool" , that means insulate the pot using a white cloth, water with colder water for example 19°C but not much less than that otherwise you could get a cold shock, and of course you should spray the plant three or four times during ten or twelve days with 3ml / L cal magic. Hope this helps my friend ! 🚀