I'm by no means an expert on this, but I had some issues with the temperature reading of the BME280. It seems to be so sensitive that simply having it on top of a Wemos D1 Mini shield PCB cause the temperatures to differ by more than 2 degrees celsius because the heat of the ESP module seems to radiate up to the BME280 (or transfers through the wires/traces). Just having my finger right above it ticked off the temperature reading, so I assumed even indirect sunlight on it or similar things might give wrong readings too.

I resorted to adding a DS18B20 for temperature readings and only using the air pressure and humidity of the BME280. I could design a PCB that moves the BME280 further away from the D1 Mini with tiny traces to avoid heat transfer, but then again I didn't want to risk it and a quick research showed that the DS18B20 seems to be reasonably accurate as well.