Can water build up in my lungs and cause inflammation/swelling if I am outside in the rain for too long and it is raining extremely heavily?

This came from a news article I read a while ago (actually it was quite some time ago, last year I think) where a man was found dead in a forest. The coroner concluded the cause of death was inflammation and swelling of the bronchi and lungs (pneumonia) and that the rain was the primary factor in why his lungs began to produce the mucus that killed him. The coroner didn't say it was from a bacteria or virus, instead the article immediately said something along the lines of being hungry and exposure to constant rain led to mucus forming in both his lungs.

He was in his late 20's (I'm in my early 20's), the report also said that while he was lost it was raining very hard and also constantly, with rainfall beyond half an inch per hour. He was also low on food and it was cold.

I know that when it is raining there's mist (liquid water) suspended in the air. Basically the news article was saying the heavy rain caused thick mist in the air and him breathing it for extended periods irritated his lungs and caused them to produce mucus and swelling (which is called pneumonia). Is it dangerous if for example I go to the store and a really heavy rainstorm breaks out?