Is it to hot for fish to bite in Kentucky?

Question

It has been in the high 80s low 90s, no rain for 5 days. Been night fishing for past three nights. No bites at all. Had all kinds of bait out. On bottom and bobbers set at different depths. Is it to hot for fish to bite? Im fishing from shore. It is a resivor and under water is lots of rocks. What am I doing wrong? Up till June we were catching tons of blue gill, some bass. I havent caught a catfish yet this year but have seen others with them.