Wind detection apparatus, which comprises: - a support structure provided with at least one support rod; - a rotatable frame pivoted in an idle manner to said support rod and susceptible of rotating around the latter; - a signaling body made of flexible material, with substantially tubular form and longitudinally extended between a first end thereof and a second end thereof, at said first end said signaling body being provided with a first edge fixed to said rotatable frame and defining at least one first opening, through which the wind is susceptible of entering inside said signaling body, acting on the latter in order to rotate said rotatable frame around said support rod until said signaling body is aligned with the direction of the wind; - an illuminating device fixed to said rotatable frame and actuatable to illuminate said signaling body; - power supply means mechanically associated with said support structure and adapted to supply at least one first alternating current; said apparatus being characterized in that it also comprises: - at least one transformer electrically connected in input to said power supply means in order to receive said first alternating current, and adapted to supply a second alternating current in output; - control means mounted on said rotatable frame, power supplied by said transformer by means of said second alternating current, and electrically connected to said illuminating device in order to supply an electrical control quantity thereto; said transformer comprising: - at least one primary winding fixed to said support rod, provided with first turns wound around said support rod, and connected to said power supply means in order to receive said first alternating current adapted to generate a magnetic field (Φ) linked with said first turns; - at least one secondary winding fixed to said rotatable frame, arranged spaced from said primary winding, and provided with second turns positioned around said support rod, electrically connected to said control means, and said magnetic field (Φ) susceptible of being linked to such second turns, said magnetic field (Φ) adapted to generate said second current passing into said second turns via magnetic induction. - a support structure provided with at least one support rod; - a rotatable frame pivoted in an idle manner to said support rod and susceptible of rotating around the latter; - a signaling body made of flexible material, with substantially tubular form and longitudinally extended between a first end thereof and a second end thereof, at said first end said signaling body being provided with a first edge fixed to said rotatable frame and defining at least one first opening, through which the wind is susceptible of entering inside said signaling body, acting on the latter in order to rotate said rotatable frame around said support rod until said signaling body is aligned with the direction of the wind; - an illuminating device fixed to said rotatable frame and actuatable to illuminate said signaling body; - power supply means mechanically associated with said support structure and adapted to supply at least one first alternating current; - at least one transformer electrically connected in input to said power supply means in order to receive said first alternating current, and adapted to supply a second alternating current in output; - control means mounted on said rotatable frame, power supplied by said transformer by means of said second alternating current, and electrically connected to said illuminating device in order to supply an electrical control quantity thereto; - at least one primary winding fixed to said support rod, provided with first turns wound around said support rod, and connected to said power supply means in order to receive said first alternating current adapted to generate a magnetic field (Φ) linked with said first turns; - at least one secondary winding fixed to said rotatable frame, arranged spaced from said primary winding, and provided with second turns positioned around said support rod, electrically connected to said control means, and said magnetic field (Φ) susceptible of being linked to such second turns, said magnetic field (Φ) adapted to generate said second current passing into said second turns via magnetic induction.