No that is not good for them. They are suppose to be around 75 with lights on and around 66 in dark. They can STAND higher and lower temps but its not good for them and especially not up and down like that every day. If it hits 88 one time and a few days later maybe drops low it might be alright but not every day. Put a fan on them man, or even 2. The ambient temp in the room might be hot but around the plants where the fans are it wont be 88. And you need to get an aircooled hood, that makes so much difference you wont believe it. If you cant do that put a fan upwards at the light to blow the heat away.