Dark spots, yellowing and crispy leaves? Help please.

Hey people,

Got some Sweet Afghan Delicious Auto going in organic soil in their last week of flowering.
Tryed looking all over but cant seem to find the same problem
Ive noticed on 2 plants that are next to each other, have started to get dark spots, yellowing and crispy leaves. It has started from the top and have know noticed it going down the plant a little bit.

im not to sure if its heat stress as ive had temps of up to 33c this last week or so.
Also not to sure if its much of a problem as ive been feeding plain water for the last seven days getting ready for harvest, but it does look like its getting worse.

im stumped?

Thanks

There's no mold is there?

Smee23 said:

There's no mold is there?

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nah man, no mold to be seen. Also i havent had humdity above 35.

sure looks like high heat. ideally you grow around 75F.

polishpollack said:

sure looks like high heat. ideally you grow around 75F.

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i thought it might be due to high heat. Had bit of a heatwave for the last few weeks so temps rocketed.
Funny thing is, its only affecting like 2 out of 10.