The sensor is located on the case (not near the exhaust) of the server. With the structure of my appartment this is the only place I can realistically put my Server but sadly also the hottest place in my appartment.
The outside temperature is supposed to reach 36°C today so I expect the ambient temp for the server to rise another 2-3 degrees.
My server is in a closet without ventilation. You will probably be fine.
My router (shit one provided by the carrier) is restarting frequently, I think due to overheating
Not worrying temps for most stuff. If you have mechanical HDDs you may want to check those specifically.
My server has also not been liking the heat over the past month

Though in my case it’s because drive 3 is sitting in a slot that is possibly not getting enough airflow. It’s consistently running a bit hotter than the other drives in the system.
I really should get around to moving it to a different slot.
Been happening to me as well. And my basement is more cool than my 1st and 2nd floor.
We’re doing fine here:

Aber Deutschland ist geschmolzen :(
How did you get your drive temps into home assistant?
*Deutschland wird schmelzen 🥲
If you feel particularly nerdy and love stats and graphs, here’s a rabbit hole for you
Oh nee :((
It’s a Synology NAS so will work with the Synology DSM integration: https://www.home-assistant.io/integrations/synology_dsm
There’s definitely ways to poll the sensors of other devices though. I had some janky sensors set up before for monitoring a standard Linux box.
Guess it might be benefitting from fans though 😄
This is the temperature right now (8:50am local time), I will comment again at 3:00pm xd Normally the ambient temperature here is over 40°C.

How is the cpu below ambient temperature?
Had the AC on in my room. It’s off since morning.
A little bit late, but here it is.

For the rack in the closet, I cut a 4" duct off the ac, and piped it into the top of the closet. For one of my computers, it seemed to always run hot, so I bought two 6" box fans and mounted one over each of the two CPU. I have a little gadget that comes with Open Hardware Monitor so I can keep an eye on it. Currently running 100 freedom degrees, but it will fluctuate +/- 10 degrees depending on load. The only downside is they are a bit noisy, not extremely, but you can hear them buzzing away keeping shit cool so I don’t complain much and just turn the music up. LOL