Abstract: A weathervane includes a pointer (8a, 8b) provided with a vane and mounted for rotation about a vertical shaft (1) by a magnetic bearing. The magnetic bearing is comprised of a lower block (2a) made integral with the shaft (1) and of an upper block (2b) capable of rotating freely about the shaft. An upper face of the lower block (2a) and a lower face of the upper block (2b) are each provided with a permanent magnet (10a, 10b), which face each other and are oriented so that they have the same polarity. The pointer (8a, 8b) is made integral with the upper block (2b).