Friends. In my city, temperatures reach 45C or more in the shade. In summer, I live in a desert area. I see that my plants aren't growing, and I think it's due to stress. Right now, it's already around 40.
The white marks on the leaves are from the sun burning them... did you start these indoors and then move them outside? If you do that, you need to introduce the plants (any plant!) to the sun gradually... I will take my indoor pots outside and put them in the shade for a day or two before getting them into full sun. It's nothing to worry about right now but if you see continued burn on your leaves, I'd pull them back into the shade a bit for a day and then try them again.
The only other thing I'd like to mention is that there are different strains for different climates... some strains need a hot climate, some need a cooler climate... so next time you choose some seeds, pay attention to the type of climate the seeds are going to require... I think these will be fine but you'd probably have better success with something like Sour Diesel or Amnesia Haze... there are lots to choose from.
Good luck - I wish MY weather was a bit warmer but not as warm as yours! :-D
Hey there Byktor, so basically in your conditions you do need something like a mister which is a machine that will mist your plants continuously. just keep filling it up. Normally it will help control the temperature and humidity. Try also an evaporative cooler. Maybe even try both. If you do this you'll see a pretty huge and immediate improvement in your conditions. The grow is all about the environment. Hope this helps ! 🚀
Are they getting enough direct sunlight on their leaves?
Cannabis needs at least 6 hours of direct sunlight on its leaves to grow properly, even if it is 45 degrees at times.
Where I live I grow outdoors in full sun with temps up to 47 degrees and as long as the plants are watered properly, they will be ok.
That looks like a little drought or overwatering stress, but nothing to be too worried about if they are photoperiod planta. They are still young. Have you started feeding nutrients?