Hi,
Thanks for your inquiry.
To use BMP390 in an outdoor application the enclosure can not be sealed. You may consider to use a piece of Gore membrane for example GAW113 at https://www.gore.com/sites/g/files/ypyipe116/files/2017-01/GORE_PEV_DataSheet_AcousticVents_Dust_Splash.pdf to cover the vent hole of BMP390 or the hole of the enclosure of your product to prevent any contamination from getting into BMP390 sensor.
Please refer to the handling, soldering and mounting instructions at https://www.bosch-sensortec.com/media/boschsensortec/downloads/handling_soldering_mounting_instructions/bst-bmp380-hs000.pdf when you design the PCB and enclosure.
Thanks.
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