A weathervane turns with every wind, so it is read as changeability — in moods, opinions or circumstances. It can also stand for paying attention to which way things are heading.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.