Summer hours start May 17 May 17, 2021 Image From May 17-August 22, we're ready when you are. Drop by the Main Library lobby, visit the Weaver Library, or contact us by chat, text, and email during these hours: Monday-Thursday 9am-7pm Friday 9am-6pm Saturday 11am-6pm Sunday 1pm-6pm The Main Library lobby is open for pickups and returns, except for holidays and closures. The rest of the Main Library building is closed. We're closed: Monday, May 31 - Memorial Day Sunday July 4 and Monday July 5 - Independence Day The Health Sciences Library is open to University of Arizona Health Sciences affiliates. Visit guidelines for using the Health Sciences Library.