Biological processes of cannabis start to break down at 95 degrees. Temps over that mark for any length of time, and your plants will die quickly from not being able to perform all their little internal functions like photosynthesis.
I grow in an attic and run an ac up there from april 1 to Oct 31, and I'm in New England... it's not pretty, but I'm on exile from my 'real' grow space for the time being.
Also keep yout day/night temp fluctuations below 15' f. 10' is safer. You want to avoid dewfall.
stinkyattic Reviewed by stinkyattic on . What temperature should the plants grow in? The temperature is about 100 degrees day time and 75 night, is that to hot? if it is, what can i do about it? Rating: 5