Yep, mostly just used to help crowdsource weather reporting like this.
Though I have seen another interesting use-case for the barometer, which is for IP-rated (water-resistant) phones, you can use the barometer to check that your device still has a water-tight seal with an app that measures the pressure as you squeeze the sides of the phone together.
“Oh yeah, are you sure about that? Then why does my AirTag say it’s already landed on Jupiter, hmm? I’d like to speak to your manager.”