What is the normal hospital hourly rate for a RN in Maine? Looking to relocate in the next year or so.

It varies on multiple factors including experience, location, type of facility, agency vs direct employee, but you can expect anywhere from $30-$50 an hour.
Maine Medical Center has a nurses union which helps make sure pay is far and competitive there, but some of the private practices pay less but have a better work life balance.
I am lucky and get to work from home in Maine for a Specialty Pharmacy and make a very competitive wage with decent benefits and a great work life balance.