Normally ranges from 79-82, but I've seen it hit 84+ as the warm summer whether comes on. However, both my tank and sump are covered which causes major heat retention. In the summer I remove the lid from the sump (and have a fan going in the cabinet). Temperature usually doesn't rise above 84. If heat is an issue, and if you haven't already, you should try opening the top and covering it with something like plastic egg crate. The evaporation from the top will dissipate a lot of heat.
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