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.
31.5°C also is just a bit slower at cooling, and computer devices easily reach 95°C without any troubles.
Yeah this temperature is nothing. Regularly gets over 40 degrees Celsius where I am, and all of my home servers have run 24/7 through it without issue, not in air conditioning.