Can you give you system specs, as well as your graphics card model?
if you live in a hot environment, with a case that doesn't have lots of airflow, and or you have an RTX 2080 Ti that's a blower or a very cheap option, 80-85C is mostly normal.
These aren't optimal temps of course, but I wouldn't worry to much about it. Turing's official max temp is 88C, so you still have some temperature headroom to spare.
The only real problem with 85C temps is that you won't be running GPU Boost at all, you'll be stuck at your base clock, resulting in 5 sometimes 10% less performance. But its still in spec, which is really all you need to worry about.
If you plan to keep your GPU for more than 5 years, I would find a way to reduce temperatures, if not you can keep your GPU running that way if you want.
Also I wouldn't advise doing any overclocking with those temps aswell.
The reason why 85C is fine is that voltage + amperage at high temperatures kills. But, When Nvidia GPUs run at those "super" high temperatures, the actual voltage levels are significantly lower than that of say 65-75C temps.
The only real danger with the high temps is if your VRMs and or VRAM is not adequately cooled, in this case the high temps could also degrade these components. However, this is really a problem with the graphics card, and not you. If your card is rated by reviewers as an excellent card that cools everything well, you have nothing to worry about.