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Really, as long as you don't get multiple days of 35+, your plants will be fine, but just drink a bit more. I grow outdoors and where I am, we get 2-6 days in a row of over 40 degrees Celsius multiple times each summer and I don't lose any plants or that they suffer at all. The average summer day temps would be around 32 degrees Celsius and the plants are fine. Day temps can be anywhere from 20 degrees to 47 degrees Celsius and as long as they are watered, nothing goes wrong. Cannabis is a tough and remarkably resilient plant and does not need "Princess Perfect" conditions, as some would make you out to believe, to survive and flourish. Believe me, even if temps are above 40, as long as you water them frequently, they will be fine. By the way, my plants are outdoors in full sun, each and every day, from day one to harvest. Been doing so for 35+ years and never had a failure that I could blame on anything except me doing something wrong. Like not watering in time. Hope this helps,.............. Organoman.