After retiring from the United States Army in 1976, Weyand moved to Honolulu, Hawaii, which was also the home of the 25th Infantry Division. He became active in Hawai'i community affairs and held a number of prominent business positions, including corporate secretary and senior vice president of First Hawaiian Bank between 1976 and 1982. He was an active member of the Rotary Club of Honolulu and a trustee of the now-dissolved Samuel M. Damon Estate, as well as the American Red Cross Hawaii Chapter, where he served as chairman of the board in 1992 and director of the Honolulu Symphony. He was active in the Sony Open golf tournament, Shriners Club, the East-West Center, the Asia-Pacific Center for Security Studies, and the Hawaii Theatre.