Depends on the humidity. 90 degrees should not harm the records as long as it is not humid. If you live in Florida--well it's much hotter there so I'm sure that's not the case, but 90 dgrees with high humidity could create 2 problems. One is warping, which can also be avoided by properly stacking your albums vertically, snug--but not tight. The other problem with exposure to humidity for a long time is that records can get moldy--something to avoid. Hope you live in a dry climate--in which case you are probably alright.
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