Yellowing leaves in HOT conditions.

You’re outside. Any deficient leaves are a breeding ground for pests and disease. The heat makes you more vulnerable. Get rid of the lowers that don’t receive direct sun that are damaged. Monitor for pests and disease. Best of luck in your grow.

They will fall off as needed

Yellowing lower shaded leaves is normal. Lack of light = lack of photosynthesis. Just leave them be till they are brown and crispy. Then either pick them up off the soil surface or pull them off at that point, purely in the interest of cleanliness. Yellowing upper leaves is a whole other matter and can be a lot of reasons. If it's deficiency, pulling yellowing or affected leaves will only aid in the progression of the issue. Because if you remove the affected leaf, then the plant will go right after another leaf, which is essentially speeding up the demise of your plant. I feel your pain with the heat. I'm not wasting my money on A/C units for a hobby that garners fuck all for profit. So i finish up my last crop at the end of may, and i take June, July and August off. It's a nice break from 9 month's of plant babysitting, and i don't have to stress over the heat. I do however have a mother plant tent that i run year round. This upcoming week is going to be 35c and i live on a 2nd floor apartment. It's gonna get hot. I've adjusted my light schedule so that the lights turn off at 1230pm, and turn back on at 630pm in my best effort to avoid peak heat hours. I may even switch to 16/8 to further help with the heat.

Hello Mister Smoker, You never want to pull a leave off! The reason these leaves faid in color is because the new growth is using the nutrients that are stocked in the leaves that fade. You need to provide the plants with some nutrients to prevent future faiding. A small dose with grow nutrients and a normal dose with flowering nutrients will do the trick and does provide them with enough NPK to stop the faiding and keep developping flowering.

Let the plant recycle what is there already, it does not go to waste then. As 0011 said, if you give them a slight tug and they fall off, then that is the time. Cutting them off just because they look less than perfect is pointless, they won't harm anything, but your plant will get benefits from the leaves being left on until the very end.

it's not going to be a huge difference, but better to let the plant suck it down. if it falls off with a touch, it's time. At the scale of a home garden, i doubt it is even a noticeable difference either way you choose.