Newer cards are made to throttle at higher temperatures like 82C to 84C range. What this means is that the card will drop its performance in an attempt to run cooler. In theory, these cards can run fine under 90C, but I consider anything above this throttle temperature, 84C, as too hot. Also, if your card is air cooled, which is most likely given your question, the GPU is now increasing the temperature for every component in your case, CPU, SSDs, M.2 drives, etc...
I would definitely try to get better airflow in the case, and drop the temperature. Upper 80s is too hot, in my opinion. While in theory, you are not going to damage anything because the hardware automatically throttles down to prevent damage, the performance drops, and heat is a major evil to longevity.
