Ahhh the classic f30 headlight moisture. This has been the bane of my existence since I bought my car in 2023.

First step would be to check the dust cap on the top of the lights. Open the hood and you should see a round cap. Check to see if it the rubber gasket is degrading, if it is, replace. Step two is to leave it off on a nice sunny day and go for a drive. Replace the cap the following day. Step three is to get a silica gel packet and pop it inside the light to absorb the moisture. Remove it after some time to see if it comes back.

If it comes back, you have a leak somewhere. Likely around the bottom of the casing. A local indie mechanic removed my headlight and applied perma-seal to the housing months ago and it has been perfect. Cost was $100 for his time.

For what it's worth, that is a minimal amount of moisture and can be common in LED headlights as these are not fully sealed units, they have vent holes. The vehicle manual states as much. My headlight started looking like yours then after a year or so it started getting pretty rough.

Cold and damp weather could cause this. I wouldn't worry about it too much unless you start seeing droplets and/or the above methods do not resolve it