87 F in grow tent . Too high?

They will be fine, they won't melt, just keep them well watered and ensure that they get good air exchange. I would advise against increasing the humidity, especially if they are in flower, it could lead to mould. 40-45% is max humidity for flowering plants. Outdoors I average between 80-110 degrees during the day when flowering is going on and the plants cope easily. There is no need to have everything exact, cannabis has survived for Millenia without help and without perfect conditions. She is not a delicate "princess perfect" type of plant that some people will have you believe, it is a highly resilient and adaptable plant that can cope with almost anything, even higher temps and remarkably easily too. Hope this helps, Organoman.

Try to lower your temperature to 82F. Cannabinoids start burning off at 81F. The higher the temp the lower you actually want your RH. Higher temperatures hold more moisture then colder temps. So even tho it says 60% RH there is actually more moisture in the air. I would say 50% RH with 82F will still grow without being slowed and should still produce without foxtails. If you can't lower the temp then dim or raise your lights, it would be your only option. This is just from my experience and personal opinion.

83 is topps. Can add co2 bags, turn lights down some till more cold air can be drawn or produced in grow area.