Are there any scientific explainations for why some people feel arthritis pain during or before rainy weather?

Maybe: Many people say they know when it is going to rain based on how there joints feel. One theory and it is just a theory, is that the barometric pressure drops ( the air pressure around us) right before it rains. This could allow for the tissues around the joint to expand, this expansion could irritate nerves and cause joint pain.

Weather joint pain: Yes. Lower barometric pressure prior to rain causes increased joint swelling leading to increased pain!