I have been looking for answers to this for several years. I joined this chat because I found it when I googled "seeing rain when it's not raining." I saw this in 2019 when I was at an event and the Theosophical Society in Wheaton, IL in the US (I had to say I was from the UK to join this group, but I really wanted to join this conversation).
The event includes many speakers on various philosophies and there is a lovely drumming ceremony at the very end. I had a booth, offering tarot readings and reflexology treatments. When the event was over I went into the bookstore to use the coupon we venders received. While in there, I looked out the window and saw a very fine, but heavy rain. We all had been worried that it was going to rain. I comment to someone, "Oh, I see it finally started to rain. Thankfully it waited until the end." The person looked at me like I was crazy and said "it's not raining."
I looked again, it was definitely raining. I went outside and I could still see it, but I could not feel it. I asked a couple more people if they saw rain, they said they could not. And the ground was not getting wet. As I walked around the building to where my booth was, I saw the rain coming down at an angle. It was still very fine, but heavy.
I could still see the rain as we packed up, but the second I left the property, it was gone.
I have thought to call the Theosophical Society to ask if anyone else has seen this on the property, but afraid they will think I'm crazy.
When I thought about it, I did remember this being mentioned in a book I had read. It seems like it was a book about a person who was psychic, but didn't want to be or something, but she said she was sitting at her kitchen table and looked out the window saw "energy rain."
I have searched, and cannot find anything on this, but this is what I think I saw at that event. That property feels very spiritual to me. I would love for those of us who have been that to maybe chat on another forum about this. It would be very interesting to compare stories and maybe find others who have experienced it. I'd be happy to start a Facebook group or something.