Off topic a bit but probably relevant. It’s a big deal on the Sense Hat, lots of complaints. There is a ground plain on the back side right behind the chip that measures temperature. In hindsight they now realize they should have just left open board with no copper there. And they don’t want to now change it because they want the ones the kids have to behave exactly like the two on the space station. I think at some point there likely will be a version 2 of the sense hat though. On one of my setups I added a Proto Hat between my Pi and my Sense Hat. I also flipped my Sense Hat 180, GPIO header is at the bottom, so hot air can get out easily. With no case temps read OK.
That Pi just sites in my house with no case measuring temp, humidity and pressure.
With my BMP180 I just made sure to mount it on the outside of my case. I put it on the bottom so the sun can’t shine directly on it skewing things. It’s a portable setup I take to our dog park to keep an eye on temps and humidity. We don’t want the dogs getting heat stroke while playing around etc. Might be hard to see in this picture but down at the bottom you’ll see some layers of clear frosted diffuser. Looks like a little PIBOW case. My BMP180 is in there. That’s to keep rain etc from getting on it, I have vent holes drilled so air can get in though. The case has minimal venting so heat can get out but rain can’t get it.